The narrator laureate of the science world, David Attenborough, describes the birth of a baby grey kangaroo.

Our friends at BBC Earth describe the video:

In this video a kangaroo is born, crawls up to its mother's pouch where a camera captures it's development from tiny, naked, grub-like newborn into a fully grown Joey.

It's amazing how the baby worm-like kangaroo is born automatically knowing how to get up into the mother's pouch. Incredible.