Following is a transcript of the video. 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 ...

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 joey ...

The infant immediately climbs into its mother's pouch and does ... centuries clearing open tracts of land and establishing water sources—both of which are boons to kangaroo populations.