The eastern grey has a soft grey, or sometimes brown fur. The fur on the chest and stomach is more pale, sometimes white. They have a small head and large ears. Their tails are about long. The male is much larger than the female. They have long eye lashes which protect their eyes from the sun. They live for around 15–20 years. Because they are marsupials, the female carries its young in special pouch. Babies are born about five weeks after mating. The tiny baby which is only about 15 millimetres long, and weighs less than one gram, crawls up into the pouch. Inside the pouch there are four nipples. The baby kangaroo, called a joey, will only use one of the nipples. It lives in the pouch for about eight months. It still drinks milk from its mother until about 18 months of age. The mother is able to have another joey in the pouch, which feeds from a different nipple. The mother provides a different mix of milk to each nipple. A joey can remain with its mother until it becomes an adult, at about four years old.