Does a cuckoo know it's a cuckoo? The answer is more difficult than you might think, explains Richard Pallardy ...
Billions of periodical cicadas emerge every 13 or 17 years in the eastern United States, creating an all-you-can-eat buffet for birds. Chip Somodevilla / Getty Images When huge broods of cicadas ...
It is spring in the northern hemisphere and birds initiate the remarkable architectural feat of building a home for the young. How is this accomplished? Hormones and Getting in the Mood Much of the ...
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