Changes in certain animals can signal earthquakes, tornadoes, heat waves and more.
In a bid to look unattractive to predators, the nestlings not only look like caterpillars but move just like them, too.
The revised look at bird development shows some surprising relationships and also details how characteristics such as birdsong evolved.
The lack of teeth in all living birds can be traced back to a common ancestor who lost its choppers about 116 million years ago.
The organization and its thousands of volunteers will take a census of birds throughout the Americas.
The glossy eggshell of a rare bird is so luminous that it actually changes color when viewed from different angles.
Visual stimuli can cause the light-fliers to falter when they're feeding.
A detailed look at a modern bird's foot is revealing the secrets of dinosaur tracks set down more than 250 million years ago.
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