Pronghorn

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Pronghorn
Temporal range: 2.5–0  Ma
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S
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Early Pleistocene – Recent
Antilocapra americana.jpg
Adult male pronghorn in Oregon
Antilocapra americana female (Wyoming, 2012).jpg
Adult female pronghorn in Wyoming
CITES Appendix I (CITES) [2] [note 1]
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Antilocapridae
Subfamily: Antilocaprinae
Tribe: Antilocaprini
Genus: Antilocapra
Species:
A. americana [3]
Binomial name
Antilocapra americana [3]
(Ord, 1815)
Subspecies

A. a. americana
A. a. mexicana
A. a. oregona
A. a. peninsularis
A. a. sonoriensis

Contents

PronghornRange.png
Range of the pronghorn

The pronghorn ( UK: /ˈprɒŋhɔːrn/ , US: /ˈprɔːŋ-/ ) [4] (Antilocapra americana) is a species of artiodactyl (even-toed, hoofed) mammal indigenous to interior western and central North America. Though not an antelope, it is known colloquially in North America as the American antelope, prong buck, pronghorn antelope, prairie antelope, or simply antelope [5] because it closely resembles the antelopes of the Old World and fills a similar ecological niche due to parallel evolution. [6] It is the only surviving member of the family Antilocapridae. [7]

During the Pleistocene epoch, about 11 other antilocaprid species existed in North America. [8] Three other genera ( Capromeryx , [9] [10] Stockoceros [11] [12] and Tetrameryx [13] ) existed when humans entered North America but are now extinct.

As a member of the superfamily Giraffoidea, the pronghorn's closest living relatives are the giraffe and okapi. [14] The Giraffoidea are in turn members of the infraorder Pecora, making pronghorns more distant relatives of the Cervidae (deer) and Bovidae (cattle, goats, sheep, antelopes, and gazelles), among others.

The pronghorn is the fastest land mammal in the Western Hemisphere, with running speeds of up to 55 miles per hour (89 km/h). It is the symbol of the American Society of Mammalogists. [15]

Discovery and taxonomy

Prior to the arrival of the Europeans, the pronghorn was particularly abundant in the region of the Plains Indians and the region of the indigenous people of the Northwest Plateau and was hunted as a principal food source by the local tribes. [16] The pronghorn has also featured prominently in Native American mythology and oral history. [17]

The scientific name of the pronghorn is Antilocapra americana. Although first seen and described by Spanish explorers in the 16th century, the species was not formally recorded or scrutinized until the expedition in 1804-06 by Captain Meriwether Lewis and Second Lieutenant William Clark. [18] Following the discovery of a few subspecies of the sharp-tailed grouse, Lewis and Clark came across the pronghorn near the mouth of the Niobrara River, in present-day Nebraska. Clark was the first European to kill a pronghorn, and described his experience as follows: [19]

I walked on shore to find an old Vulcanoe [the Ionia Volcano?] ... in my walk I killed a Buck Goat of this Countrey, about the height of the Grown Deer, its body Shorter the horns which is not very hard and forks 23 up one prong Short the other round & Sharp arched, and is immediately above its Eyes the Color is a light gray with black behind its ears down the neck, and its face white round its neck, its Sides and its rump round its tail which is Short & white; Verry actively made, has only a pair of hoofs to each foot, his brains on the back of his head, his Nostrals large, his eyes like a Sheep he is more like the Antilope or Gazelle of Africa than any other Species of Goat.

Lewis and Clark made several other observations on the behavior of the pronghorn and how the local tribes hunted them. They described the animal, which they referred to as the "Antelope" or the "Goat", as follows: [20]

Of all the animals we have seen the Antelope seems to possess the most wonderful fleetness. Shy and timorous they generally repose only on the ridges, which command a view of all the approaches of an enemy ... When they first see the hunters they run with great velocity ... The Indians near the Rocky Mountains hunt these animals on horseback, and shoot them with arrows. The Mandans' mode of hunting them is to form a large, strong pen or fold, from which a fence made of bushes gradually widens on each side. The animals are surrounded by the hunters, and gently driven towards this pen, in which they imperceptibly find themselves enclosed, and are then at the mercy of the hunters.

The pronghorn was first officially described by American ornithologist George Ord in 1815. [20]

Description

Pronghorns have distinct white fur on their rumps, sides, breasts, bellies, and across their throats. Adult males are 1.3–1.5 m (4 ft 3 in–4 ft 11 in) long from nose to tail, stand 81–104 cm (32–41 in) high at the shoulder, and weigh 40–65 kg (88–143 lb). The females are the same height as males, but weigh 34–48 kg (75–106 lb). The feet have two hooves, with no dewclaws. Their body temperature is 38 °C (100 °F). [8] [21] [22] [23]

Head of an adult male Pronghorn Nebraska 1.jpg
Head of an adult male

The orbits (eye sockets) are prominent and set high on the skull. Their teeth are hypsodont, and their dental formula is 0.0.3.33.1.3.3.

Profile of an adult male Antilocapra americana male (Wyoming, 2012).jpg
Profile of an adult male

Each horn of the pronghorn is composed of a slender, laterally flattened blade of bone which is thought to grow from the frontal bones of the skull, or from the subcutaneous tissues of the scalp, forming a permanent core. [24] As in the Giraffidae, skin covers the bony cores, but in the pronghorn, it develops into a keratinous sheath which is shed and regrown annually. Unlike the horns of the family Bovidae, the horn sheaths of the pronghorn are branched, each sheath having a forward-pointing tine (hence the name pronghorn). Males have a horn sheath about 12.5–43 cm (4.9–16.9 in) (average 25 cm (9.8 in)) long with a prong. Females have smaller horns that range from 2.5–15.2 cm (1–6 in) (average 12 centimetres (4.7 in)) and sometimes barely visible; they are straight and very rarely pronged. [22] Males are further differentiated from females in having a small patch of black hair at the angle of the mandible. Pronghorns have a distinct, musky odor. Males mark territory with a preorbital scent gland which is on the sides of the head. [8] They also have very large eyes with a 320° field of vision. Unlike deer, pronghorns possess a gallbladder. [25]

The pronghorn is the fastest land mammal in the Western Hemisphere, being built for maximum predator evasion through running. The top speed is dependent upon the length of time over which it is measured. It can run 35 mph for 4 mi (56 km/h for 6 km), 42 mph for 1 mi (67 km/h for 1.6 km), and 55 mph for 0.5 mi (88.5 km/h for 0.8 km). [21] [26] While it is often cited as the second-fastest land animal, second only to the African cheetah, [27] it can sustain high speeds longer than cheetahs. [7] The pronghorn may have evolved its running ability to escape from now-extinct predators such as the American cheetah, since its speed greatly exceeds that of all extant North American predators. [7] [28] :318 Compared to its body size, the pronghorn has a large windpipe, heart, and lungs to allow it to take in large amounts of air when running. Additionally, pronghorn hooves have two long, cushioned, pointed toes which help absorb shock when running at high speeds. [29] They also have an extremely light bone structure and hollow hair.

Pronghorns are built for speed, not for jumping. Since their ranges are sometimes affected by sheep ranchers' fences, they can be seen going under fences, sometimes at high speed. For this reason, the Arizona Antelope Foundation and others are in the process of removing the bottom barbed wire from the fences, and/or installing a barbless bottom wire. [30]

The pronghorn has been observed to have at least 13 distinct gaits, including one reaching nearly 7.3 m (8.0 yd) per stride. [7]

Range and ecology

Pronghorns in Fort Rock, Oregon Antelope1.jpg
Pronghorns in Fort Rock, Oregon

The present-day range of the pronghorn extends from southern Saskatchewan and Alberta in Canada south into the United States Through Montana, Idaho, Utah, Nevada, Arizona, Wyoming, Colorado, New Mexico, Washington, (southwestern Minnesota and central Texas west to coastal southern California) [31] [32] and northern Baja California Sur, to Sonora and San Luis Potosí in northern Mexico. [8] [33]

A subspecies known as the Sonoran pronghorn (A. a. sonoriensis) occurs in Arizona and Mexico. [22] Other subspecies include the Mexican pronghorn (A. a. mexicana), the Oregon pronghorn (A. a. oregona), and the critically endangered Baja California pronghorn (A. a. peninsularis).

Pronghorn herd, Yellowstone National Park PronghornAntelopeHerdYNP2009.jpg
Pronghorn herd, Yellowstone National Park

Pronghorns prefer open, expansive terrain at elevations varying between 900 and 1,800 m (3,000 and 5,900 ft), with the densest populations in areas receiving around 25–40 cm (9.8–15.7 in) of rainfall per year. They eat a wide variety of plant foods, often including plants unpalatable or toxic to domestic livestock, though they also compete with them for food. [21] In one study, forbs comprised 62% of their diet, shrubs 23%, and grasses 15%, [21] while in another, cacti comprised 40%, grass 22%, forbs 20%, and shrubs 18%. [22] Pronghorns also chew and eat (ruminate) cud.

Healthy pronghorn populations tend to stay within 5.0–6.5 km (3.1–4.0 mi) of a water source.

An ongoing study by the Lava Lake Institute for Science and Conservation and the Wildlife Conservation Society shows an overland migration route that covers more than 160 mi (260 km). [34] The migrating pronghorn start travel from the foothills of the Pioneer Mountains through Craters of the Moon National Monument to the Continental Divide. Dr. Scott Bergen of the Wildlife Conservation Society says "This study shows that pronghorn are the true marathoners of the American West. With these new findings, we can confirm that Idaho supports a major overland mammal migration - an increasingly rare phenomenon in the U.S. and worldwide." [35]

Cougars (Puma concolor), wolves (Canis lupus), coyotes (Canis latrans), grizzly bears (Ursus arctos horriblis) and bobcats (Lynx rufus) are major predators of pronghorns. Golden eagles (Aquila chrysaetos) have been reported to prey on fawns and adults. Jaguars (Panthera onca) also likely prey on pronghorns in their native range in the southwestern United States and in northern Mexico.

Herd of pronghorns Gabelbock fws 2.jpg
Herd of pronghorns

Social behavior and reproduction

Pronghorns form mixed-sex herds in the winter. In early spring, the herds break up, with young males forming bachelor groups, females forming harems, and adult males living solitarily. [28] Some female bands share the same summer range, and bachelor male bands form between spring and fall. Females form dominance hierarchies with few circular relationships. [36] Dominant females aggressively displace other females from feeding sites.

Doe with fawns about an hour old, near Fort Davis, Texas, 1947. Photo by Smithsonian zoologist Helmut Buechner Doe with fawns about 1 hour old, Ft. Davis, Texas, 1947.jpg
Doe with fawns about an hour old, near Fort Davis, Texas, 1947. Photo by Smithsonian zoologist Helmut Buechner
Juvenile fawn in New Mexico Antilocapra americana juvenile.jpg
Juvenile fawn in New Mexico

Adult males either defend a fixed territory that females may enter, or defend a harem of females. A pronghorn may change mating strategies depending on environmental or demographic conditions. [28] :228 Where precipitation is high, adult males tend to be territorial and maintain their territories with scent marking, vocalizing, and challenging intruders. [37] In these systems, territorial males have access to better resources than bachelor males. [37] Females also employ different mating strategies. "Sampling" females visit several males and remain with each for a short time before switching to the next male at an increasing rate as estrous approaches. "Inciting" females behave as samplers until estrous, and then incite conflicts between males, watching and then mating with the winners. [38] Before fighting, males try to intimidate each other. If intimidation fails, they lock horns and try to injure each other. [22] "Quiet" females remain with a single male in an isolated area throughout estrous. [38] Females continue this mating behavior for two to three weeks. [22]

When courting an estrous female, a male pronghorn approaches her while softly vocalizing [39] [28] and waving his head side to side, displaying his cheek patches. [40] The scent glands on the pronghorn are on either side of the jaw, between the hooves, and on the rump. [22] A receptive female remains motionless, sniffs his scent gland, and then allows the male to mount her. [28]

Pronghorns have a gestation period of 7–8 months, which is longer than is typical for North American ungulates. They breed in mid-September, and the doe carries her fawn until late May. The gestation period is around six weeks longer than that of the white-tailed deer. Females usually bear within a few days of each other. [21] Twin fawns are common. [29] Newborn pronghorns weigh 2–4 kg (4.4–8.8 lb), most commonly 3 kg (6.6 lb). In their first 21–26 days, fawns spend time hiding in vegetation. [37] Fawns interact with their mothers for 20–25 minutes a day; this continues even when the fawn joins a nursery. [37] The females nurse, groom, and lead their young to food and water, as well as keep predators away from them. [37] Females usually nurse the young about three times a day. [21] Males are weaned 2–3 weeks earlier than females. [37] Sexual maturity is reached at 15 to 16 months, though males rarely breed until three years old. Their lifespan is typically up to 10 years, rarely 15 years. [21] [22] [23]

Population and conservation

Pronghorns in Montana Pronghorn antelope.jpg
Pronghorns in Montana
Male adult pronghorn in Yellowstone National Park 2015-06-10 Pronghorn in Yellowstone National Park, USA 7862.jpg
Male adult pronghorn in Yellowstone National Park

At the turn of the 20th century, members of the wildlife conservation group Boone and Crockett Club had determined that the extinction of the pronghorn was likely. In a letter from George Bird Grinnell, Boone and Crockett Club chairman of the game preservation committee, to Walter L. Fisher, Secretary of the Interior, Grinnell stated, "The Club is much concerned about the fate of the pronghorn which appears to be everywhere rapidly diminishing." By the 1920s, hunting pressure had reduced the pronghorn population to about 13,000. [7] Boone and Crockett Club member Charles Alexander Sheldon, in a letter to fellow member Grinnell, wrote, "Personally, I think that the antelope are doomed, yet every attempt should be made to save them." Although the club had begun their efforts to save the pronghorn in 1910 by funding and restocking the Wichita Game Refuge in Oklahoma, the National Bison Range in Montana, and the Wind Cave National Park, in South Dakota, most of the efforts were doomed since experience demonstrated that after initial increases the pronghorns would die off because of the fenced enclosures. In 1927, Grinnell spearheaded efforts along with the help of T. Gilbert Pearson of Grinnell's National Audubon Society to create the Charles Alexander Sheldon Antelope Refuge in northern Nevada. About 2900 acres of land were jointly purchased by the two organizations and subsequently turned over to the Biological Survey as a pronghorn refuge. This donation was contingent upon the government's adding 30,000 acres of surrounding public lands. On June 20, 1929, United States President Herbert Hoover included the required public lands upon request of the Department of Agriculture and the Department of the Interior after learning that the Boone and Crockett Club and the National Audubon Society were underwriting the private land buyout. On January 26, 1931, Hoover signed the executive order for the refuge. On December 31, 1936, president Franklin Roosevelt signed an executive order creating a 549,000-acre tract; this was the true beginning for pronghorn recovery in North America. [41]

The protection of habitat and hunting restrictions have allowed pronghorn numbers to recover to an estimated population between 500,000 and 1,000,000 since the 1930s. [1] Some recent decline has occurred in a few localized populations, [21] due to bluetongue disease which is spread from sheep, but the overall trend has been positive.

Pronghorn migration corridors are threatened by habitat fragmentation and the blocking of traditional routes. In a migration study conducted by Lava Lake Institute for Science and Conservation and the Wildlife Conservation Society, at one point, the migration corridor bottlenecks to an area only 200 yards wide. [42]

Pronghorns are now quite numerous, and outnumbered people in Wyoming and parts of northern Colorado until just recently. They are legally hunted in western states for purposes of population control and food. No major range-wide threats exist, although localized declines are taking place, particularly to the Sonoran pronghorn, mainly as a result of livestock grazing, the construction of roads, fences, and other barriers that prevent access to historical habitat, illegal hunting, insufficient forage and water, and lack of recruitment. [1]

Three subspecies are considered endangered in all (A. a. sonoriensis, A. a. peninsularis), or part of their ranges (A. a. mexicana). The Sonoran pronghorn has an estimated population of fewer than 300 in the United States and 200–500 in Mexico, while there are approximately 200 Peninsula pronghorn in Baja California. [1] Populations of the Sonoran pronghorn in Arizona and Mexico are protected under the Endangered Species Act (since 1967), and a recovery plan for this subspecies has been prepared by U.S. Fish and Wildlife Service. [1] Mexican animals are listed on CITES Appendix I. Pronghorns have game-animal status in all of the western states of the United States, and permits are required to trap or hunt pronghorns. [1]

Related Research Articles

Springbok Antelope of southern and southwestern Africa

The springbok is a medium-sized antelope found mainly in southern and southwestern Africa. The sole member of the genus Antidorcas, this bovid was first described by the German zoologist Eberhard August Wilhelm von Zimmermann in 1780. Three subspecies are identified. A slender, long-legged antelope, the springbok reaches 71 to 86 cm at the shoulder and weighs between 27 and 42 kg. Both sexes have a pair of black, 35-to-50 cm (14-to-20 in) long horns that curve backwards. The springbok is characterised by a white face, a dark stripe running from the eyes to the mouth, a light-brown coat marked by a reddish-brown stripe that runs from the upper fore leg to the buttocks across the flanks like the Thomson's gazelle, and a white rump flap.

Antelope Term referring to an even-toed ruminant

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Giant eland An open-forest and savanna antelope of the family Bovidae

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Gerenuk Long-necked species of antelope (Litocranius walleri)

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Antilocapridae Family of mammals belonging to even-toed ungulates

The Antilocapridae are a family of artiodactyls endemic to North America. Their closest extant relatives are the giraffids with which they comprise the superfamily Giraffoidea. Only one species, the pronghorn, is living today; all other members of the family are extinct. The living pronghorn is a small ruminant mammal resembling an antelope.

Red-fronted gazelle Species of mammal

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Sonoran pronghorn Subspecies of mammal

The Sonoran pronghorn is an endangered subspecies of pronghorn that is endemic to the Sonoran Desert.

The Mexican pronghorn is a pronghorn native to Mexico and the United States.

<i>Ramoceros</i> Extinct genus of mammals

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Mammals of Glacier National Park (U.S.)

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<i>Stockoceros</i> Extinct genus of mammals

Stockoceros is an extinct genus of the North American artiodactyl family Antilocapridae, known from Mexico and the southwestern United States. Its horns are each divided near their base into two prongs of roughly equal length.

<i>Tetrameryx</i> Extinct genus of mammals

Tetrameryx is an extinct genus of the North American artiodactyl family Antilocapridae, known from Mexico, the western United States, and Saskatchewan. The name means "four [horned] ruminant", referring to the division of each horn near its base into two prongs; in T. shuleri, the rear prong is much longer.

<i>Merriamoceros</i> Extinct genus of mammals

Merriamoceros is an extinct genus of pronghorn. It is known from a single species, which is also the type species, M. coronatus.

<i>Capromeryx</i> Extinct genus of mammals

Capromeryx was a genus of dwarf pronghorns (Antilocapridae) that originated in North America during the Pliocene about 5 million years ago. The closest living relative and only surviving member of the family is the North American pronghorn. Capromeryx furcifer is one of the smallest artiodactlys known, being 24 inches (61 cm) at the shoulder and 25 pounds (11 kg) in weight.

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Notes

  1. Only populations of Mexico.