The shift from lizard-like sprawl to upright walking in mammals wasn’t a smooth climb up the evolutionary ladder. Instead, it was a messy saga full of unexpected detours. Using new bone-mapping tech, ...

The evolution of the modern mammal jaw is more complex than previously thought, according to a new analysis of fossils ...

The plains viscacha looks a lot like a chinchilla, but it's known for building vast tunnels underground and for producing more than 300 eggs at one time. Across the vast plains of southern South ...