Alpha Wolf

Wolves in the wild live in family packs, mostly consisting of three to a dozen members, usually related. Each pack has an alpha or top male and an equivalent female, and each top wolf keeps order among the pack members of its gender. Generally, only the top male and female mate, but occasionally the alpha male stands aside and allows the beta (second place) male to breed the alpha female.
An aggressive wolf carries his tail straight behind, a submissive one tucks his tail between his legs.
Submissive wolves avoid eye contact with dominant members of the pack and may turn away from their betters. Many inferior wolves grovel to their superiors, mimicking the cub behavior of soliciting food by licking at the muzzle of the dominant animal. Sometimes, they lie on the ground and expose their bellies to the alpha wolf, and they may urinate to further state their acknowledgement that the alpha is truly the top wolf.
The purpose of this social order is to increase hunting prowess and ensure the survival of the pack and therefore the species.