The sixth mass extinction on Earth is upon us, confirms an extensive new study. Here are just a handful of its victims.
A song produced by male nightingales communicates dad skills to attentive, listening females.
Songbirds have a compelling reason to get out of bed early: mating.
The population of the yellow-breasted bunting has plunged by 90 percent since 1980.
Who needs cupid when you have built-in arrows to attract the opposite sex?
Birds click their bills with great rhythm -- but why?
Some animals are warm-blooded, while others are cold-blooded. What sets them apart, and what advantages does each kind have over the other?
The beaks of chicken embryos were reverted into snouts more similar to ones seen in Velociraptors.
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