The wolf is the largest wild member of the dog family. It can be many colours, from white to black, but most often grey. Wolves live in groups, or packs, of three to seven individuals, and there is always a dominant male and a breeding female. The pack is hierarchical, and each wolf has its own place in the group. The order of the pack is displayed each time the wolves meet by caressing, romping, tail wagging, wrestling, and many other expressions.