About half a million years ago, several sloths, armadillos, and horses fell into a sinkhole in Florida’s Big Bend region. […] ...

The ability to regulate body temperature, a trait all mammals and birds have today, may have evolved among some dinosaurs early in the Jurassic period about 180 million years ago, suggests a new ...

Roughly half a million years ago, a group of armadillo-like mammals, horses, and sloths met their end in a sinkhole in what ...

But most animals that light up are found in the depths of the ocean. In a new study, scientists report that deep-sea corals that lived 540 million years ago may have been the first animals to glow ...

which first entered marine environments several million years ago, have stacked up evolutionarily to their land-based counterparts. Scientists discovered sea snakes have undergone some remarkably ...

Early ancestors of the ocean's biggest animals once walked ... and perfectly adapted to life underwater, these marine mammals once walked on four legs. Their land-dwelling ancestors lived about 50 ...