Researchers have discovered how orange cats got their coats — and why so many of them are male. The coat color comes from a genetic mutation on the X chromosome of orange, calico and tortoiseshell cats.

Researchers have discovered an ancient moth-like sea predator in a treasure trove of museum fossils in Canada. The half-a-billion-year-old creature, Mosura fentoni, reveals that Cambrian arthropods were more diverse than previously thought.

New fossilized tracks made by an ancient reptile indicate that these animals evolved tens of millions of years sooner than scientists first thought.