Actually, kangaroos have TWO nipples in the pouch and each provides milk in a different formula, for two young ones in different stages of development. Meanwhile, the female has another young one in a state of suspendid animation, in utero, waiting until the eldest joey stops nursing.

Be VERY glad you're not a kangaroo doe! They're always supporting 3 offspring!

Um, no, kangaroos do have teats, but they're inside the pouch, AFAIK.

Useless fact for you, the only animal whose balls are in front of their slug. For what I would think is an obvious reason.