What was the first sexual intercourse like? A new study finds it involved fish and looked a lot like a square dance.
A new study shows how bird wrists evolved from those of their dinosaur predecessors.
Fossilized, primitive amphibians with odd-looking appendages suggest the ability of some vertebrates to regenerate or regrow amputated limbs first evolved at least 300 million years ago.
Birds didn't evolve in one fell swoop from their dinosaur ancestors, suggests a newly constructed dinosaur family tree.
Some sloth lineages grew more than 220 pounds every million years, one of the fastest body growth rates known in the evolution of mammals.
Discovery of three new Jurassic Era animals suggests that early mammals, which resembled squirrels, first emerged 208 million years ago. Continue reading →
Once thought to be pointless and on the evolutionary fast track to disappearance, new research has given the whale pelvis bone a new lease on life.
New research finds that nighttime behavior may have evolved 100 million years earlier than mammals did.
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