Narrator: At first glance, a kangaroo's pouch looks like nothing but a built-in baby sling. But if you peeked inside, you'd see it's far more complex than a simple pocket. It has to be, because the ...

Adorable baby animal videos are some of the internet’s favorite things to watch. This Instagram video depicts a joey excitedly crawling into its mother’s pouch. Kangaroo pouches offer warmth, support, ...