Mammals and dinosaurs coexisted on Earth until a catastrophic event 66 million years ago killed 75% of life on the planet.

Biologists have confirmed the existence of a 200-million-year-old species of egg-laying mammal that has been assumed to be extinct.

You are probably familiar with kangaroos. Wallabies, too, and most likely quokkas as well. Less famous are their small, endangered cousins, the bettongs. These little marsupials love to dig and have a ...

Researchers identified an early mammal ancestor whose eggs may have helped it survive the Great Dying 250 million years ago.

While conservation efforts have bolstered the populations of many species considered to be threatened in 2025, many animal and plant species continue to dwindle in number, with some even going extinct ...