If you had to name the number-one distinguishing characteristic about kangaroos, it would probably be those big, bouncy feet. But second place? It's definitely the pouch. Female kangaroos, like all marsupial females, are equipped with a special pouch they use to carry around their newborn babies. Most of us know that part, but it's less clear what that pouch is actually like on the inside. Like the inside of your pants pocket? Like a fluffy tote bag? It turns out that a kangaroo's pouch actually feels lot more ... biological than that.