Tetrapods general

A Reflection on Natural History (Part 2)

Before the Scientific Revolution, any attempt to ascribe order to nature was largely rooted in the study of holy texts, rather than in the nature of minerals and organisms themselves. The development of natural history as an observational science in the seventeenth century changed this entirely and lives on to be a crucial element in the study of living organisms today.

It has become popular in the modern era to dismiss natural history as “mere” classification, lacking empirical methods, but this could not be further from the truth. Accurate classification is an essential element of understanding the natural world. There is not a more essential answer to the question “what is x?” than to give the classification of x, i.e. put it in relation to other living beings. Such an indefinite number of characteristics can be inferred by an organism’s taxonomic standing alone that this serves as a sort of shortcut to ripping individual organisms to shreds and painstakingly having to analyze and reanalyze the constituent parts of each individual organism. While an understanding of the anatomy of individuals within a species is of interest to some and has intrinsic value, the understanding of organisms in context with other similar and dissimilar organisms also has value. For those with questions unconcerned with the minutia of differences between individuals and who are focused with broader themes in evolution or organismal biology, a system of classification serves as a heuristic to understanding basic aspects of the organism at hand in relation to its own or other groups of organisms. Today, rather than defining natural groups by shared characteristics, these characteristics aid in the diagnoses of natural groups, which rather are defined by evolutionary relatedness. Still a need for the accurate classification of organisms persists.

Natural history as an observational rather than experimental science is not an outdated way of conducting zoology, ecology, or botany. Research lab settings are artificial and for those concerned with ethology, ecology, and observational field studies are crucial for comprehending the life history and behavior of animals and plants. Such observational studies have formed the bedrock of the modern understandings of these subjects. Even experimental studies themselves are inspired by observational studies after all.

Carolina Parakeet specimens are among the irreplaceable extinct specimens held in the Tetrapod Collection. (Photo Credit: Chelsea Hothem 2016)

Carolina Parakeet specimens are among the irreplaceable extinct specimens held in the Tetrapod Collection. (Photo Credit: Chelsea Hothem 2016)

Natural history museums and the specimens they contain also retain both intrinsic and practical value. Far from ‘mere’ cabinets of curiosities, natural history specimens serve as physical records of organisms, vouchers, from throughout history. The tags of these specimens usually record the location where the specimen was collected, the date, the stomach contents of the organism (for animals), pre-preparation measurements, the name of the collector, the cause of death, and many other bits of information that prove invaluable for research. Each specimen is comparable to a library book brimming with information that can inform future scientists on topics ranging from biodiversity, species distribution, the changes in species over time, impacts of humans over time, genetic information, historic climates, and conservation.

A young bluebird (Sialia sialis) that died after being entangled in this plastic. This is an unfortunate reminder that what humans do with their trash has repercussions for other species.This specimen was prepared by Tetrapod Curatorial Assistant, Grant Terrell and is now housed in the Museum of Biological Diversity’s Tetrapod Collection. (Photo: Grant Terrell, 2016)

A young bluebird (Sialia sialis) that died after being entangled in this plastic. This is an unfortunate reminder that what humans do with their trash has repercussions for other species.This specimen was prepared by Tetrapod Curatorial Assistant, Grant Terrell and is now housed in the Museum of Biological Diversity’s Tetrapod Collection. (Photo: Grant Terrell, 2016)

A modern example of the utility of museum collections is the application of DDT and its effects on North American birds. Chemicals within DDT were responsible for the terminal thinning of eggshells in birds exposed to the pesticide. Not until contemporary eggs could be compared with eggs in museum collections, were scientists able to confirm why avian populations were suffering.  If naturalists had not been consistently collecting eggs from North American bird species, humans may have continued using DDT without fully understanding its effects on non-targeted species. The value of a particular specimen only increases with time. This lesson can effortlessly be learned after only a single encounter with a specimen of a recently extinct species such as the Passenger Pigeon. Individuals within museum collections and the observations of naturalists are now all that remain for researchers with questions about such species. The advent of new technologies only increases the value of the work of naturalists such as Sir Hans Sloane. Researchers now sequence the DNA of specimens and compare it to that of modern individuals. It is unknowable what advances may further enhance the value of the study of natural history.

Thus it is very important to ensure preservation of specimens for future generations. Please support our efforts through our current fundraiser.

About the Author: Grant Terrell is a second year student at the Ohio State University who is currently double-majoring in Evolution & Ecology and History. He currently works as a Curatorial Assistant in the Tetrapod Collection of the Museum of Biological Diversity and focuses on Ornithology.

About the Author: Grant Terrell is a second year student at the Ohio State University who is currently double-majoring in Evolution & Ecology and History. He currently works as a Curatorial Assistant in the Tetrapod Collection of the Museum of Biological Diversity and focuses on Ornithology.

Works Cited

Huxley, Robert. The Great Naturalists. London: Thames & Hudson, 2007. Print.

Otter, Christopher. “Natural History.” History 3712. The Ohio State University Main Campus, Columbus. 6 Sept. 2016. Lecture.

Stott, Rebecca. Darwin’s Ghosts: The Secret History of Evolution. New York: Spiegel & Grau, 2012. Print.

Wintering strategies of our endangered animals

Over the past weeks we have seen that animals employ three strategies to survive our cold Northern hemisphere winters: migrate, hibernate or adapt. Many bird species migrate, amphibians and reptiles hibernate and mammals, in particular large ones, adapt. So today let’s look at how some  of the endangered or even extinct species survive(d) the winters in Ohio – only 5 more days to contribute to our campaign to purchase a new mobile cabinet for our endangered tetrapods, let’s keep them safe!

male Bachman's Warbler

male Bachman’s Warbler (Whatbird.com)

The Bachman’s Warbler, like most of today’s species in the family wood warblers, migrated south, in this case to Cuba. It is an example of how migratory birds face even more risks than their cousins who stay year-round in one place. Its populations probably declined dramatically as a result of habitat destruction both on the breeding and wintering grounds. The last confirmed breeding record of this species was in 1937, and it has not been reported since 1988.

 

Indiana bats in cave

Indiana bats cluster together and hibernate during winter in caves, occasionally in abandoned mines. For hibernation, they require cool, humid caves with stable temperatures, under 50° F but above freezing. Only a few caves within the range of the species (Eastern USA) have these conditions. To survive up to 6 months of hibernation they rely on their energy reserves in the form of fat. The stored fat is their only source of energy because insects are rare in the middle of winter. If bats are disturbed during hibernation and move around they use up more energy and may starve.

Hibernating Indiana bats in cave

Hibernating Indiana bats (Wikipedia)

The Allegheny woodrat is adapted to cold conditions: Its fur becomes slightly darker and longer and it caches food in small caves or rock crevices. They feed mainly on plant material which means that they need large piles of it as they eat about five percent of their weight daily. You can imagine that woodrats are busily preparing for the winter these days.

 

The Carolina Parakeet was rather unusual for a parrot species.

image_carolina_parakeet02First of all it was the only parrot species that ever occurred natively in the USA. Furthermore it did not migrate south in the winter but weathered the cold. This may explain why some of today’s introduced parrot species survive in the wild just fine. Did you know that the last two known parakeets, Lady Jane and Incas, lived together for thirty-two years in the Cincinnati Zoo, the same zoo the last Passenger Pigeon lived? Lady Jane died in 1917 and Incas, soon after, on February 21, 1918.

group of Eskimo Curlews

The Eskimo Curlew migrated to South America where it overwintered in wet pampas grasslands, intertidal and semi-desert areas. A long flight from the breeding grounds in the tundra of the Western Arctic.

The Passenger Pigeon established winter “roosting” sites in the forests in the southern US states, Arkansas to North Carolina south to the uplands of the Gulf Coast states. Birds timed their movements with the availability of food.

We hope this made you appreciate these species even more; please help us preserve their remains for future generations to study. Donate today!

Specimen Photo Shoot: Roll it Out Specimens

Roll it Out: Specimen Photo Shoot

Curious what the extinct and highly endangered specimens we will be moving to the mobile cabinet look like? One of our student research assistants took detailed photos just for YOU. All of these specimens are considered irreplaceable and some being the last records of their species. Be sure to check out our campaign page for information on how to to support the collection and help us roll out the irreplaceable specimens represented from the photos below.

 

A research assistant shows off a tiger cub.

Chelsea Hothem, Student Research Assistant

PHOTOS BY: Chelsea Hothem, 2016

Where’s Waldo?

While reading our “Meet the Staff” post, you probably saw that the term “geo-referencing” came up a number of times. What does geo-referencing mean and what purpose does it serve in a museum? It’s a fair question since geo-referencing isn’t exactly an everyday activity, yet it plays an important role in the digitization of our collection.

Here’s the scenario: you’re sitting at home and hear a very loud smack. You go to see what happened, and find a bird has slammed right into your window. The bird is dead but you know a place where it can live on forever, the Museum of Biological Diversity’s Tetrapod Collection. You put the body in a freezer bag and take it over to the collection in order to donate it. This is known as salvaging and the whole process begins with that one action. If you have more questions there is a whole webpage devoted to the contribution of specimens to the Tetrapod Collection.

After our preparation lab assistants prepare a bird, it is given a label, a number, and is entered into the database. In the database we enter in the name of the collector, when it was collected, the species name, and the location. However, we can’t simply just put an address in for the location, we need to be much more thorough than that. We use latitude and longitude in order to map out points where our specimens were found. It helps build a species list of an area and maintain consistency when landmarks are removed or names are changed. In short, it reduces the uncertainty of a location.

Having a specimen with latitude and longitudinal points clears up some of the following questions: For instance, a bird crashed into your window. What side of the house did the bird hit? Was it the north side, or was it the east side? How far from the house was it? Two feet? Maybe three? Sometimes a person can’t really give us information that is too specific, but we can still work with a general location given with a specimen. We’ll simply find the area that the specimen was found so we can use varying degrees of uncertainty that depend on the specificity of the locality provided.

Geo-referencing is a common practice among scientists and research collections such as ours. Thanks to modern technology, we now have the ability to more accurately map out the presence of a particular species and assess the population’s health with more certainty. There are many times when scientific discoveries or conservation efforts rely on citizen scientists such as you making an interest in what we as a scientific institution do. Contributing a deceased specimen to a museum like ours counts as one of those times.

Species of December: Snowy Owl

When choosing a species for the month of December, an obvious choice came to mind: Reindeer. However, writing about the Reindeer would be supporting a Christmas cliché and not everyone celebrates the holidays in the same way. So I decided to choose an animal that better represents the advent of winter and the calming beauty that this time of the year brings.

With a wingspan of about five feet, the Snowy Owl (Bubo scandiacus) is a beautiful and iconic bird that is not often seen around Ohio. During the summer, they can only be found above the Arctic Circle where they hunt prey such as ptarmigan, waterfowl, and lemmings. The only time you are likely to see one of these owls is during the winter when they often move south to northern states of the U.S. such as Ohio, New York, and Colorado. We have a few Snowy Owl specimens here in the museum, all of which have been collected in Ohio. Among them is the almost famous Snowy Owl from Hardin County in 2012. You may have seen this owl yourself since it stayed in place for several weeks or read about it in the Columbus Dispatch.

The Snowy Owl

One of the mounted Snowy Owls from our collection

Unlike most owls, Snowys, as birders lovingly refer to them, are diurnal (meaning that they’re active during the day. The Arctic Circle has 24-hour sunlight during the summer, and these birds have adapted to such conditions. Because these owls live in very cold temperatures, they have developed a bulky body with dense feathering especially on their legs; thus, these birds are the heaviest owls in North America. Unlike most owl species, Snowy Owls nest on the ground and have a tendency to sit in one place for hours on end to the point where they can become invisible against a snowy backdrop. Male Snowy Owls have a very unique courtship that involves flapping their wings in a “V” formation, and dropping a prey item in front of the female for her consumption. While they appear to be peaceful and calm, Snowy Owls will vigorously defend their territory against other species and some individuals have even been recorded attacking Arctic Wolves. To learn more about an owl’s biology one can search for pellets that these birds regurgitate which contain leftovers of the last meal, such as bones, hair and teeth. Learn more about dissecting owl pellets through this video. If you’d like to learn more general facts about Snowy Owls, feel free to visit the Cornell Lab of Ornithology’s page on them.

Snowy Owl Talons

As you can see, Snowy Owls have feet that have a thick covering of feathers to help shield them from very cold temperatures

One of the Snowy Owl’s more remarkable feats is that it has been recorded to be able to hunt up to 1,600 lemmings in a single year. In an environment as barren as the Arctic Tundra, one would think that at this rate of hunting, the lemming population would be seriously affected. Yet scientists have never been able to conclusively prove the link between heavy predation of aerial predators such as the Snowy Owl, and the lemmings’ population fluctuation. However, a recent study by Therrien et. al (2014) shows, for the first time, that relentless predation by aerial predators can play an important role in the cyclic depression in lemming population during the warmer periods on the tundra. The study also found that breeding populations of arctic avian predators increased vastly as a result of high lemming population densities. And it is in those years of abundance that young Snowy Owls often move far south in search of food. This fall Snowy Owls have already been sighted as far south as Illinois.

Whether you celebrate any of the winter holidays or enjoy the oncoming winter, the Snowy Owl is a beautiful bird whose presence can add to the spirit of the season and the tranquility this time of year brings.

From all of us at the Tetrapod Collection, we wish you a very Happy Holiday Season!

 

References

Decker, Theodore. “Snowy Owl on ‘Dispatch’ Front Page Found Dead.” Columbus Dispatch 13 Jan. 2012

http://www.dispatch.com/content/stories/local/2012/01/13/snowy-owl-starved-to-death-bird-expert-says.html

“Snowy Owl.”, Life History, All About Birds. https://www.allaboutbirds.org/guide/Snowy_Owl/lifehistory

Therrien, J. F., Gauthier G., Korpimaki E. 2014 Predation Pressure by Avian Predators Suggests Summer Limitation of Small-mammal Populations in the Canadian Arctic. Ecology 95, 56-67. http://www.esajournals.org/doi/abs/10.1890/13-0458.1

 

Species of November: Leatherback Sea Turtle

From the massive wingspan of the American White Pelican to the incredible size of the Eastern Hellbender, recently the focus has been on very large specimens from the Tetrapod Collection. So for this month’s post, I’d like to write about one more giant specimen we have and end the trilogy of the colossal species.

Leatherback Sea Turtle

Our gigantic Leatherback Sea Turtle

With an average length of seven feet and an average weight of 2,000 pounds, the Leatherback Sea Turtle (Dermochelys coriacea) is the largest species of turtle on the planet. Leatherbacks are believed to have the widest global distribution of any vertebrate, meaning they can be found in any of the world’s temperate oceans. Like most other sea turtles, leatherbacks feast on soft bodied organisms such as jellyfish, squid, blue-green algae, etc… One unique trait of the Leatherback Sea Turtle is that it has the ability to maintain warm body temperatures in cold water. Reptiles are famously “cold-blooded” and can only heat up their bodies using their surroundings. However, Leatherback Sea Turtles seem to be able to generate and maintain their own body heat through adaptations such as their large body size, changes in blood flow and a thick layer of fat. The leatherback is the only sea turtle species that doesn’t have a hard bony shell. A leatherback’s top shell (carapace) consists of leathery, oil-saturated connective tissue that is almost rubbery to the touch. Even after decades of storage at the museum, oils are still leaking from the carapace of our specimen. For more general facts about the Leatherback Sea Turtle, visit the National Geographic’s website .

All seven species of sea turtles (leatherbacks included) are endangered, with some species even being classified as critically endangered (meaning they are facing an extremely high risk of extinction in the wild). There are a number of reasons for the turtles being in danger of extinction such as poaching, habitat loss, pollution, collisions with boats, people stealing turtle eggs, etc…

Turtle Girl

Just so you can get an idea of how large these turtles are, here is Tetrapod Volunteer Abby Miller sitting beside our specimen

However, a paper by Lewison, Freeman and Crowder (2004) discusses another reason for the turtle’s decline. When fishermen throw out their nets in hopes of catching fish such as sardines or mackerel, they often end up catching many other animals such as dolphins, sharks, and sea turtles by mistake. This is known as bycatch, and many times these other non-target species will see drastic reductions in population because of it. I know it may be hard to picture an animal as massive as the Leatherback Sea Turtle getting caught in these nets, but these are very large nets that are often used for large groups of fish. When a turtle becomes entangled in the net, they can drown or suffer external injuries while struggling to get out. This study aimed to determine what effect bycatch has on leatherback numbers and what they found was shocking. According to their research, 50,000 leatherback sea turtles were caught as bycatch in the year 2000. This research and other investigations like it, have led to some new policies regarding the use of drift nets. According to the American Bird Conservancy, Russia has banned the use of drift nets due to the harm they cause to seabirds, marine mammals and other aquatic species such as sea turtles.

As I had mentioned earlier, all sea turtle species are endangered and the Leatherback is no exception. This phenomenon of bycatch illustrates how much damage commercial fishing can do to the oceans’ ecosystems and how we should think of ways to alleviate this problem. There has already been much success in reducing bycatch by using specially designed nets that help free any turtles that become ensnared, and many fishermen have begun to employ these nets in their everyday work. These animals are unique due to their immense size and awe-inspiring presence, to lose them would be a major defeat for conservationists worldwide.

References:

“Leatherback Sea Turtles, Leatherback Sea Turtle Pictures, Leatherback Sea Turtle Facts – National Geographic.” National Geographic. http://animals.nationalgeographic.com/animals/reptiles/leatherback-sea-turtle/

Lewison R. L., Freeman S. A., Crowder L. B. 2004 Quantifying the Effects of Fisheries on Threatened Species: The Impact of Pelagic Longlines on Loggerhead and Leatherback Sea Turtles. Ecology Letters 7, 221-231.

http://onlinelibrary.wiley.com/doi/10.1111/j.1461-0248.2004.00573.x/full

Nevins, Hannah. “Russian Ban on Drift Net Fishing Bodes Well for Seabirds American Bird Conservancy.” American Bird Conservancy. N.p., 31 July 2015

http://abcbirds.org/russian-ban-on-drift-net-fishing-bodes-well-for-seabirds/

What’s in a Name?

Thank you for taking an interest in the Tetrapod Collection and what we do here. Just like the collection itself, our blog is always growing. Recently we’ve had many stories to tell and new, exciting topics to write about. Today I will announce a name change of the blog and give you some reasoning why we decided to do this.

You may be familiar with blogs of other natural history collections and their catchy names. Among our collections at the OSU Museum of Biological Diversity the insect collection has a very timely blog that is aptly named ”The Pinning Block.” A pinning block is a surface where preserved insects are pinned down, so having a blog named after something that the insect collection uses daily is a great way to attract interest.

So I have been thinking about what we do in the Tetrapod Collection and how we can put this into the blog’s name. It turned out to be a challenging exercise: The Tetrapod Collection holds about 4,800 amphibians, 2,300 reptiles, 17,000 birds, and 5,200 mammals; in addition to this we house many preserved bird eggs, nests and skeletons. Not to mention, many of the specimens have historical value due to them dating back to the late 1800’s. And if that weren’t enough, we also have preserved specimens from three extinct species of birds. Not to brag, but our collection is pretty impressive and deserves an awesome blog to go with it. But what is the unifying feature of this collection?

It really was not easy to come up with a good name for a blog about tetrapods. It turns out that we do not use a particular tool every day that can be used as a good name (like the insect collection’s pinning block). Also, we preserve vertebrates but not all of them. The museum has a separate fish collection and we thus do not want to call it a vertebrate collection blog as we do not include the largest group of vertebrates, the fishes. I came up with some suggestions of new blog names and had the collection staff vote on them. After much deliberation and careful consideration, a verdict was reached and the name was changed. So it gives me great pleasure to announce that from now on, the Tetrapods Collection’s blog will be called…

Fur, Feathers, Fangs, and Frogs

News and Musings from the OSU Tetrapod Collection

This is an improvement on the name that we already had by making it catchier and more alliterate:

Fur = Mammals

Feathers = Birds

Fangs = Reptiles

Frogs = Amphibians

Let us know what you think about the new name and share it with colleagues, friends, and family. Under our new and catchier name, we will continue to post about on goings and news in the collection.

Species of October: Eastern Hellbender

Most of the amphibian species in the Tetrapod Collection are preserved in jars and, since the specimens are rather small, many of these jars aren’t very big. For something like a frog or a toad, a large jar isn’t really needed. However, there is one species of amphibian that is so massive, we need to use our biggest jars in order to contain it. If you like amphibians, you may want to read on.

The Eastern Hellbender (Cryptobranchus alleganiensis alleganiensis) is a salamander species that can reach up to two feet in length. Just think about the average salamander length of 4-8 inches, and then triple that! If that isn’t enough to impress you, these salamanders can have a life expectancy of anywhere

A jar containing two Eastern Hellbenders from our collection

A jar containing two Eastern Hellbenders from our collection

from 25 to 60 years! With that kind of lifespan, the Eastern Hellbender can probably outlive most of your pets. Just like their name implies, the Eastern Hellbender is found throughout the eastern U.S. with a few populations in the southern end of Ohio. They are aquatic amphibians that can be found under large stones in rocky riverbeds where there is an abundance of their favorite food item, crayfish. They have wrinkly brown skin, which is often used by observers to distinguish them from their closely related cousins, the Mudpuppy. For more general facts about the Eastern Hellbender, visit the Ohio Amphibians website.

We have eleven Eastern Hellbender specimens in the collection, the oldest of which was collected in the Ohio River near Cincinnati on March 22nd in 1901 (bottom left on the map). The last specimen to be added to the collection was from 1970, with no new specimens added since then. Given the size of these animals, coupled with the fact that more than half of our hellbender specimens from Ohio, you may wonder why you’ve

Localities where hellbenders were collected

Localities where hellbenders were collected

never seen one in the wild (if you have, then I truly envy you). Well in, addition to being nocturnal, these salamanders have become rather rare. While there has been some recent improvement, the population of hellbenders has been steadily declining in the last few decades. Threats such as pollution of rivers, disease, and stocking of game fish, have reduced the Eastern Hellbender’s numbers noticeably.

So as I’m sure you can imagine, finding an animal for research is very difficult. According to a recent paper by Olsen et. al (2012), eDNA methods could prove useful in finding hellbenders for study. The idea behind Environmental DNA (or eDNA) is that, by analyzing a sample of water or soil, you will be able to determine what species are in the area. In this study, Olsen et. al were able to detect Eastern Hellbenders by using the eDNA method on samples of water from rivers where these animals may be found. This opens up a whole new set of possibilities for scientific research since this method can make finding specimens much easier. To learn more about Olsen, Briggler, and Williams’ study, please click here.

It’s easy to see why these salamanders got the name hellbender. Thanks to their massive size, amazing longevity, and rarity in the wild, the Eastern Hellbender has earned a place in the hearts and minds of many naturalists; and if we keep our rivers and streams clean, we can ensure this will be true for many years to come.

References:

“Eastern Hellbender.” Ohio Amphibians. N.p., 26 Feb. 2012. http://ohioamphibians.com/salamanders/Hellbender.html

“Ohio’s Hellbender Population Set Up for Success.” Ohio Department of Natural Resources. N.p., 09 Oct. 2014.

http://ohiodnr.gov/news/post/ohio-s-hellbender-population-set-up-for-success

Olsen, Z. H., Briggler J.T., Williams R.N. 2012 An eDNA Approach to Detect Eastern Hellbenders (Cryptobranchus A. Alleganiensis) Using Samples of Water. Wildlife Research 39, 629-36. http://www.publish.csiro.au/?paper=WR12114

Species of August: Timber Rattlesnake

by Raymond Gonzo

Part of the Tetrapod collection holds preserved reptiles, most of which represent native Ohio species along with several species from other parts of North America. To find a Species of the Month, I ventured down the aisles of shelves with jars of snakes, lizards, turtles, and tortoises. When I saw this Timber Rattlesnake, one of our collection’s most impressive reptilian specimens, I made my choice. I chose an animal that is feared, and misunderstood, by many.

Attaining an average length of about 3-4 feet, the Timber Rattlesnake (Crotalus horridus – a frightening name for an animal that rather avoids than seeks conflict) is a fairly large snake. Like most snakes, Timber Rattlesnakes are feared by a lot of people who don’t understand them well enough. It’s important to remember that snakes such as the Timber Rattlesnake don’t seek out conflict with humans, but rather try to avoid it. A part of the fear people have for snakes comes from common misconceptions, which these facts below will hopefully clear up.

Their range stretches throughout most of the temperate forests in the Eastern United States and Canada, however they can no longer be found in Maine and Ontario. Here in Ohio, they can really only be found at the southern end of the state. Timber Rattlesnakes will mate during the spring and fall with the females giving birth to anywhere from 4-14 young during the late summer. What’s interesting about rattlesnakes (Timbers included) is that they give birth to live young, which is very unusual for a reptile. Many reptiles, just like birds, usually lay eggs from which their young hatch after some incubation time. When the snakes feel threatened, Timber Rattlesnakes will rattle their iconic tails as a warning to potential predators that get too close. These snakes eat a wide assortment of small mammals and can sense their prey using special heat sensory organs that are located on their heads. These sensory organs are known as loreal pits and are a characteristic common to all members of the pit viper family, which includes rattlesnakes.

When Timber Rattlesnakes deliver a bite, deadly venom will be injected through the snake’s hollow fangs and into the victim. A common misconception is that snakes are poisonous; when in actuality they are venomous. Venomous organisms directly inject venom into the victim whereas poisonous organisms have a poisonous substance covering their body making them dangerous only when eaten or touched. Learn more general facts about Timber Rattlesnakes from an Ohio Certified Volunteer Naturalist.

Quite a bit of research has been done on these snakes, a few years ago Rokyta et al (2013) reported that components of their venom seem to have changed. Some species of snakes (Timber Rattlesnake included) have undergone a dramatic shift in the lethality, and composition of the venoms they produce. Traditionally, Timer Rattlesnakes produced a hemorrhagic type of venom, which causes the snake’s victims to bleed to death from the inside out (visit the Snakes and Spiders web site for a full description of how snake venom works). However, this study shows that, at the southern end of their range, Timber Rattlesnakes are beginning to develop a bite consisting of neurotoxin venom. Neurotoxins attack the victim’s central nervous system resulting in cardiac arrest and trouble breathing thus making it much deadlier than hemorrhagic toxins. Similar research on the evolution of snake venoms is being done at the molecular level by researchers in the Gibbs lab here at OSU.

Timber Rattlesnakes are amazing animals that encompass both beauty and lethality. Their status as a top predator has even landed them a place in history as the species of snake that appears on the “Don’t Tread on Me” flag. While these are highly venomous creatures, it’s important to remember that they just want to be left alone and do their best to avoid conflict with humans. Should a Timber Rattle snake bite you or someone you are with then please follow the procedures outlined by the Wild Backpacker to ensure a safe and speedy recovery from any venom related injuries. If you ever encounter a Timber Rattlesnake NEVER try to approach or pick it up, instead leave it alone and in turn it will leave you alone. Timber Rattlesnakes remind us that sometimes it best to admire natural beauty from a distance.

References

“Snake Bite First Aid and Treatment.” Wild Backpacker – Survival articles
http://www.wildbackpacker.com/wilderness-survival/articles/treating-a-snake-bite

Rokyta D.R., Wray K.P., and Margres M.J. 2013 The Genesis of an Exceptionally Lethal Venom in the Timber Rattlesnake (Crotalus Horridus) Revealed through Comparative Venom-gland Transcriptomics. BMC Genomics 14, 394. BioMed Central. http://www.biomedcentral.com/1471-2164/14/394/

“Understanding Snake Venom and How It Works.” Snakes and Spiders, 3 Nov 2009.
http://www.snakesandspiders.com/understanding-snake-venom-works/

Brown Bats and Red Bats and Myotis Oh my!

An evening walk, in search of the Ohio State University’s only flying mammal, the bat.

 

BioPresence and the Museum of Biological Diversity’s Tetrapod Collection presents an evening with Count Dracula’s counterpart and the only flying mammal found in the world, the bat. Come learn more and follow around some of Ohio’s most unique and fascinating mammals. With the use of a bat detector we will be recording what species we are finding and documenting as much of the local campus bat life as possible.

 

All are welcome: Bat Walk will occur Tuesday August 25th 2015 at 8:15PM and meeting location to be announced closer to event.