The grey kangaroo is a sociable animal by nature and lives in a band or mob. An average mob is made up of a mature male, two or three females with young and two or three young males. Many mobs often graze together. They feed mainly late at night and early morning, resting during the heat of the day. Kangaroos often graze alongside sheep and cattle, and, because they have teeth in both upper and lower jaw, unlike sheep which have teeth in only the lower, they can crop grass more closely than sheep. Kangaroos can also survive on poor quality grass and go without water for long periods.