What prompts the embryos of certain frogs to hatch early if shaken by a hungry reptile but not if buffeted by an outside force such as rain? According to biologist Karen Warkentin, it's a ...
The American green tree frog is a staple of summer nights in the U.S. South, where its groaning call echoes through countless swamps, forests, fields, and backyards. Yet even for many people who share ...
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