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A change or the process of change by which an organism or species becomes better suited to its environment.

Admixture (Genetic)
Genetic admixture occurs when two or more previously isolated and genetically differentiated populations begin interbreeding. Admixture results in the introduction of new genetic lineages into a population. It has been known to slow local adaptation by introducing foreign, unadapted genotypes (known as genetic pollution). It also prevents speciation by homogenizing populations and increasing heterozygosity. [Courtesy of]

Adrenocorticotropin Hormone
Adrenocorticotropic hormone (ACTH) is a hormone produced in the anterior, or front, pituitary gland in the brain. The function of ACTH is to regulate levels of the steroid hormone cortisol, which released from the adrenal gland.

Active Solicitation
Also called “proceptivity.” In the Proestrous stage of breeding wolves, female wolves show behaviors towards a mate in the form of prancing, body rubs and pawing, nuzzling or putting her chin on her mate’s back. As well as presenting her rear to her mate’s nose.

Active Submission
In active submission, the submissive animal approaches another wolf in a low posture, slightly crouched, ears back and close to its head, and tail held low. The submissive wolf wags its tail or hindquarters and attempts to lick or mouth the other wolf’s muzzle. Active submission occurs curs often in “greeting,” during “group ceremonies” in which dominant wolves become the focus of nuzzling, licking, and mouthing about the face by other members of the pack, and as a “nose-push” given by submissive animals toward dominant ones when they are still a few meters away.

L. David Mech;Luigi Boitani. Wolves: Behavior, Ecology, and Conservation (p. 93). Kindle Edition.

The term sometimes used to describe the dominant wolves in the social order of the wolf pack. Because a free-ranging wolf pack is a family comprising the parents and their offspring, the term “alphas” has been superseded by “breeding pair” or “breeders” or simply “parents.”

Philosophical viewpoint arguing that human beings are the central or most significant entities in the world. Anthropocentrism regards humans as separate from and superior to nature and holds that human life has intrinsic value while other entities (including animals, plants, mineral resources, and so on) are resources that may justifiably be exploited for the benefit of humankind.

Aristotle (Politics, Bk. 1, Ch. 8) maintains that “nature has made all things specifically for the sake of man” and that the value of non-human things in nature is merely instrumental.

Hatched or born in an undeveloped state and requiring care and feeding by the parents. The word is derived from the Latin root alere, meaning “to nurse, to rear, or to nourish” and indicates the need for young to be fed and taken care of for a long duration.

AZA (American Zoo and Aquarium Association)
[Mexican Gray Wolves]
An association of zoological parks and aquariums in North America that governs over 100 facilities and oversees the governance of the SSP’s and other captive breeding programs.

Annual Growth Rate
Percent growth every year in a population. The annual percentage growth rate is simply the percent growth divided by N, the number of years.

AZGFD (Arizona Game and Fish Department)
[Mexican Gray Wolves]
One of the state agencies that participates in the management of the Mexican gray wolf in the recovery area.

An ethical perspective holding that all life deserves equal consideration or has equal moral standing.

BRWRA (Blue Range Wolf Recovery Area)
[Mexican Gray Wolves]
This includes all of the Apache National Forest and all of the Gila National Forest. This area includes over 4 million acres of mountain,s forests, and grasslands within the historic Mexican wolf range in the U.S.

A payment or other reward for removing or killing certain species of animals designated as harmful. Federal and state governments have used bounties as part of their predator control programs to encourage people to kill wolves.

Breeding Pair
The term used to refer to the male and the female in the pack who mate and produce offspring.

The effects of breeder loss on wolves; SM Brainerd, H Andrén, EE Bangs… – The Journal of …, 2008 – Wiley Online Library

Buffer Zone
An area between territories occupied by established wolf packs. Prey species often flourish in buffer zones. Wolves that have dispersed and that are alone often find relative safety and food in buffer zones with less risk of being attacked and killed by members of established packs. However, buffer zones are not necessarily neutral areas and therefore safe havens. These zones may be contested by resident packs.