On Saturday, Aug. 10, CFAES’ Secrest Arboretum in Wooster is holding a free public bird walk. You can see and learn to identify birds, such as the ruby-throated hummingbird shown here. And you can also see what the birds have to say about the arboretum’s plants and ecosystems. “One of the most useful things that birds can indicate,” an EnvironmentalScience.org webpage called “Birds as Environmental Indicators” says, “is overall habitat quality.” (Photo: Getty Images.)