alpha male
noun
noun: alpha male; plural noun: alpha males
the dominant male animal in a particular group.
"two of them trotted over to greet the alpha male, a black wolf with a greying muzzle"
a man tending to assume a dominant or domineering role in social or professional situations.
"most alpha males need to control the women in their lives"
In studies of social animals, the highest ranking individual is sometimes designated as the alpha. Alpha animals usually gain preferential access to food and other desirable items or activities, though the extent of this varies widely between species.
Alphas may gain preferential access to sex or mates; in some species, only alphas or an alpha pair reproduce.
Alphas may achieve their status by superior physical strength and aggression, or through social efforts and building alliances within the group. The individual with alpha status sometimes changes, often through a fight between the dominant and a subordinate animal.
Such fights may or may not be to the death. In some packs, an animal would kill their opponent to show how strong they are.