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 fossilized remains of the mare and her tiny, unborn foal are revealing new insights into reproduction in ancient horses.
A scrappy, furry plant-lover named Luck coexisted with dinosaurs and provides important new insights into the evolution of Earth's earliest mammals.
Hummingbird beaks aren't just for nectar sipping. They can double as weapons in the mating game.
Green anole handles arrival of an invasive competitor by making better toes in a mere 20 generations.
Our ancestor's ability to survive the mass extinction event that wiped out the dinosaurs could have important medical applications that one day could help a manned trip to Mars.
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