At first glance, a kangaroo's pouch looks like ... That's thousands of times its birth weight. That rapid growth is thanks to the pouch's four nipples, which spout milk that contains More from ...

The most likely explanation is that it's an adaptation to Australia's unforgiving environment. Multiple vaginas — and ...

The tiny Matschie’s tree kangaroo, considered endangered by International Union for Conservation of Nature since 1996, can be seen poking its head out of its mother’s pouch in a post by the ...