Newly Discovered Prehistoric Whale Is 'Deceptively Cute'—It's Tiny but Has a Mouth Full of Razor-Sharp Teeth

About 25 million years ago, the warm, shallow seas off the southern coast of Australia were home to a bountiful scene of ocean-dwelling creatures. “In these seas, there was this extraordinary abundance of life, including all these little whales, giant penguins, sharks—about a third, or even twice as long as today’s great white shark—and various oth...