Unusual fish that walk and breathe air turn out quite differently when raised on land, rather than in water.
The specimen, approximately 560 million years old, contains fibrous bundles that appear to be muscle tissue, an important evolutionary adaptation.
Foot bones more than 40 million years old, from Antarctica, reveal a creature standing more than 6 and a half feet tall.
Study reveals the key factor behind the transformation of theropods into high fliers.
Birds' eggs show pigment and structural adaptations that let just the right amount of sun reach the embryos.
A chunk of 20-million-year-old amber rediscovered from an old collection reveals a locust with remnants of wings that the insect has since lost. Continue reading →
Dinosaurs would still be around today, and humans never would have emerged, if an asteroid hadn't struck Earth right when it did 66 million years ago.
A newly discovered dinosaur species offers hints that feathers were much more common among the ancient beasts than once thought.
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