The red kangaroo can produce two different kinds of milk from the adjacent teats at the same time!

The tiny joey is attached to one of the teats.

The other teat is available to feed the joey who had just left the pouch.

The elder brother is given richer milk to suit his needs.

The milk offered to the elder joey who has left the pouch is

33% percent higher in proteins and 400 % higher in fats!