The Alpha Hirogen was the title given to the leader of a Hirogen hunting party or pack. The Alpha was seconded by a Beta. If the Alpha Hirogen was killed or otherwise unable to command the hunting party, the Beta Hirogen replaced him as leader.
Another such Alpha came to know that the Hirogen would die out soon unless he found a way to save them. That came in using holodeck programs to have Hirogen warriors fight holograms and not real opponents. (VOY: "The Killing Game", "The Killing Game, Part II", "Flesh and Blood")