Pampas deer

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Pampas deer
O. bezoarticus buck.jpg
Male Pampas deer in Serra da Canastra National Park.
Pampas deer nursing fwan.jpg
Female Pampas deer nursing fawn in the Pantanal, Brazil.
CITES Appendix I (CITES) [2]
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Cervidae
Subfamily: Capreolinae
Genus: Ozotoceros
Ameghino, 1891
O. bezoarticus
Binomial name
Ozotoceros bezoarticus
Ozotoceros bezoarticus map.svg

Cervus bezoarticusLinnaeus, 1758

The Pampas deer (Ozotoceros bezoarticus) is a species of deer that live in the grasslands of South America at low elevations. [3] They are known as veado-campeiro in Portuguese and as venado or gama in Spanish. It is the only species in the genus Ozotoceros.


Their habitat includes water and hills, often with winter drought, and grass that is high enough to cover a standing deer. [4] Many of them live on the Pantanal wetlands, where there are ongoing conservation efforts, and other areas of annual flooding cycles. Human activity has changed much of the original landscape. [5]

They are known to live up to 12 years in the wild, longer if captive, but are threatened due to over-hunting and habitat loss. [6] Many people are concerned over this loss, because a healthy deer population means a healthy grassland, and a healthy grassland is home to many species, some also threatened. Many North American birds migrate south to these areas, and if the Pampas deer habitat is lost, they are afraid these bird species will also decline. [7] There are approximately 80,000 Pampas deer total, with the majority of them living in Brazil. [8]

Taxonomy and evolution

Fossil records indicate that New World deer traveled to South America from North America as part of the Great American Interchange around 2.5 million years ago, following the formation of the Isthmus of Panama. They rapidly evolved into different species, with only a few surviving today. Due to the large continental glaciers and the high soil acidity in areas where there were no glaciers, a huge part of the fossil record has been destroyed, so there is no indication of what these early New World deer looked like. Fossil records begin with clear differentiation and are close to what they look like now. The Pampas deer evolved as plains dwellers; their direct ancestor first appeared during the Pleistocene epoch. [9] [10]

The deer may have evolved without culling predators[ clarification needed ] because when alarmed, they stamp their feet, have a particular trot and whistle, and deposit odor. [3] Pampas deer have a similar gene pattern to the related marsh deer of the genus Blastocerus, having two fused chromosomes. [3]

There are five recognised subspecies: [11]

Pampas deer are among the most genetically polymorphic mammals. Their current high nucleotide diversity shows that they had very large numbers in the recent past. [9]

Physical characteristics

Pampas deer have tan fur, lighter on their undersides and insides of legs. Their coats do not change with the seasons. They have white spots above their lips and white patches on their throats. [3] Their shoulder height is 60–65 cm (24–26 in) in females and 65–70 cm (26–28 in) in males. [12] Their tails are short and bushy, 10 cm to 15 cm long, and when they run, they lift their tail to reveal a white patch, just like white-tailed deer. [3]

Adult males typically weigh 24–34 kg (53–75 lb), but have been documented up to 40 kg (88 lb), and females typically weigh 22–29 kg (49–64 lb). [12] They are a small species of deer, with relatively little sexual dimorphism. Males have small, lightweight antlers that are 3-pronged, which go through a yearly cycle of shedding in August or September, with a new grown set by December. The lower front main prong of the antlers is not divided, but the upper prong is. Females have hair whorls that look like tiny antlers stubs. Females and males have different stances during urination. [3] [13] Males have a strong smell secreted from glands in their back hooves that can be detected up to 1.5 km away. [4] Compared to other small ruminants, the males have small testicles relative to their body size. [14]

Biology and behavior

Pampas deer running in Serra da Canastra National Park. PNSC Veado Campeiro Correndo.jpg
Pampas deer running in Serra da Canastra National Park.

In Argentina, the mating season is December to February. In Uruguay, the mating season is February to April. Courtship behavior is submissive, such as low stretching, crouching, and turning away. [15] The male initiates courtship with a low stretch. He makes a soft buzzing sound. He nuzzles the female and may flick his tongue at her, and averts his eyes. He stays near her, and may follow her for a long time, smelling her urine. Sometimes the female responds to courtship by lying on the ground. [3]

Pampas deer do not defend territory or mates, but do have displays of dominance. They show dominance by keeping their heads up and trying to keep their side forward, and use slow, deliberate movements. When bucks are challenging each other, they rub their horns into vegetation and scrape them on the ground. They may urinate into the scrape they've made, and sometimes defecate. They rub the scent glands on their heads and faces into plants and objects. They usually do not fight, but just spar with each other, and they do commonly bite. Sparring is initiated by the smaller buck touching noses with the larger buck. [3] Groups are not separated by sex, and bucks will drift between groups. There are usually only 2-6 deer in a group, but there can be many more in good feeding areas. They do not have monogamous pairs, nor are there harems. [3] [4]

When they feel they may be in danger, they hide low in the foliage and hold, and then bound off about 100–200 meters, often looking back at the disturbance. Because they bound in long flat jumps and have not been observed to run, they are not thought to be endurance runners. If they are alone, they may just quietly slip away. Females with a fawn will fake a limp to distract a predator, or if they are unsure of a situation, such as if a human appears. [3]

They will often stand on their hind legs to reach food or see over something. They are sedentary, with no seasonal or even daily movements. They usually feed regularly during the day, but sometimes have nocturnal activity. [4] The Pampas deer are very curious and like to explore. Although this is endearing to observers, their lack of fleeing at the sight of humans makes them easier for poachers to kill. [3]


Pampas deer have been seen eating new green growth, shrubs, and herbs. Most of the plant life they consume grows in moist soils. To see if Pampas deer compete with cattle for food, their feces were studied and compared to cattle feces. They do in fact eat the same plants, but in different proportions. The pampas deer eat less grass and more forbs (flowering broad leafed plants with soft stems) and browse (shoots, leaves, and twigs), respectively. During the rainy season, 20% of their diet consists of new grasses. They will move with the availability of food, particularly the flowering plants. The presence of cattle increases the amount of sprouting grass, which is preferred by Pampas deer, furthering the idea that the deer do not compete with cattle for food. [16] Opposing research shows that Pampas deer avoid areas inhabited by cattle, and when cattle are absent have much larger home ranges. [7]


Fawns can be seen at any time of year, but there is a peak in September and November. Females separate themselves from the group to give birth, and keep the fawn hidden away. After giving birth, the female goes into heat and usually mates within the next 48 hours. The fawns are small and spotted, and lose their spots at about 2 months old. Usually only one fawn weighing about 2.2 kg is born after a gestation period lasting over 7 months. At 6 weeks, they can eat solid food and begin to follow their mother. They stay with their mothers for at least a year, and also reach sexual maturity at about a year. [4]

Threat of extinction

Pampas deer taken in a ranch in Rocha Department, Uruguay (2015) Venado-Campo-UY-Ozotoceros bezoarticus.jpg
Pampas deer taken in a ranch in Rocha Department, Uruguay (2015)

The Pampas deer of southern Argentina, once very abundant, are now considered a threatened species by the IUCN. The IUCN separates the subspecies O. b. celer in southern Argentina as endangered. The diseases that particularly plague O. b. celer are gut parasites and foot and mouth diseases. Their overall decline is also due (in part) from hunting and poaching, but also from agricultural habitat loss (thus exposing deer to diseases from domesticated and feral livestock), competition from more recently-introduced wildlife, and general over-exploitation. There is less than 1% of their natural habitat left that was present in 1900. [9] The deer in Argentina and Uruguay have fewer natural predators. They used to be the prey of cougars and many more jaguars. Those in Brazil still have the felines to fear. Some areas with low population are easily attributed to poaching, due to a sudden lower number of deer in an area. In the mid-1970s, ten individuals, out of a group of 16 located in Punta Medanos, were killed by poachers. The rest were extirpated by extensive human activity. Lack of funding and technology have made it difficult for biologists to track and aid the deer population, while donations and grants from organizations and universities in the United States have helped immensely with the situation. In 1975, there were less than 100 of the subspecies O. b. celer, but by 1980, there were around 400. The population has been continuing to increase, although not at an incredibly fast pace. One of the discrepancies is simply the fact that, later on, previously unknown subspecies and groups were discovered. [8]

Local people often blame the deer for outbreaks of disease in their livestock, particularly Brucellosis in cattle. In one instance, the Uruguayan government was going to cull some of their Pampas deer population, until research by field veterinarians had shown that Pampas deer rarely carry the disease. Only then did the government give them time to assess the deer’s health. Funded by the Disney Conservation Fund, they were able to prove that the deer pose no threat of spreading disease to livestock. [7]

Trade for commercial purposes is banned. They are legally protected in Argentina, where there is a private and federal reserve set aside for the deer. In some areas, strict regulations on poaching is all that was necessary to quickly increase the population size. Increasing public knowledge, and monitoring road construction operations, has also helped. They reproduce well in captivity, and are sometimes reintroduced into the wild. [9]

In 2006, GPS trackers were placed on 19 Pampas deer, although 8 of those did not record data. The individuals were monitored over a period of 4–18 days, for researchers to collect data on their movements, and thus understand how to better help them. [17]

Relations with humans and culture

The Pampas deer have been harvested into the millions. Between 1860 and 1870, documents for the port of Buenos Aires alone show that two million Pampas deer pelts were sent to Europe. Many years later, as roads were built through the pampas, cars made it even easier for poachers to get to the deer. They were also killed for food, medicinal purposes, and for sport. As of 2003, there are fewer than 2,000 of them in Argentina and Uruguay. Both Argentina and Uruguay have declared the Pampas deer "natural monuments" but the hunting continues, although much less frequently now. The decimation of the Pampas deer has been likened to that of the bison of North America. Also similar to the bison, is the role they played in the life of the Native Americans of Uruguay and Argentina, being used for food, hides, and medicine. The Native Americans at first participated in the harvesting of the Pampas deer pelts for sale, and in spite of that, the deer population stayed strong until the Native Americans of those countries were defeated by European settlers. The settlers brought large agricultural expansion, uncontrolled hunting, and new diseases to the deer with the introduction of new domestic and feral animals. [4]

Some landowners have set aside some of their property as a reserve for the deer, as well as keeping cattle instead of sheep. Sheep graze much more on the land and are more of a threat to the deer. The owners that choose cattle are doing it as a service, because more money is made from raising sheep than cattle. Conservationists encourage this trend by sharing research that more edible vegetation is available on ranches with cattle and deer during times of drought than on ranches with cattle and sheep. [7]

Related Research Articles

<span class="mw-page-title-main">Deer</span> Family of mammals

Deer or true deer are hoofed ruminant mammals forming the family Cervidae. The two main groups of deer are the Cervinae, including muntjac, elk (wapiti), red deer, and fallow deer; and the Capreolinae, including reindeer (caribou), white-tailed deer, roe deer, and moose. Male deer of all species, as well as female reindeer, grow and shed new antlers each year. In this, they differ from permanently horned antelope, which are part of a different family (Bovidae) within the same order of even-toed ungulates (Artiodactyla).

<i>Pudu</i> Genus of mammals belonging to the deer, muntjac, roe deer, reindeer, and moose family of ruminants

The pudus are two species of South American deer from the genus Pudu, and are the world's smallest deer. The chevrotains are smaller, but they are not true deer. The name is a loanword from Mapudungun, the language of the indigenous Mapuche people of central Chile and south-western Argentina. The two species of pudus are the northern pudu from Venezuela, Colombia, Ecuador, and Peru, and the southern pudu from southern Chile and south-western Argentina. Pudus range in size from 32 to 44 centimeters tall, and up to 85 centimeters (33 in) long. The southern pudu is classified as near threatened, while the northern pudu is classified as Data Deficient in the IUCN Red List.

<span class="mw-page-title-main">European fallow deer</span> Species of hooved mammal

The European fallow deer, also known as the common fallow deer or simply fallow deer, is a species of ruminant mammal belonging to the family Cervidae. It is historically native to Turkey and possibly the Italian Peninsula, Balkan Peninsula, and the island of Rhodes in Europe. Prehistorically native to and introduced into a larger portion of Europe, it has also been introduced to other regions in the world.

<span class="mw-page-title-main">Maned wolf</span> Species of carnivore

The maned wolf is a large canine of South America. It is found in Argentina, Brazil, Bolivia, Peru, and Paraguay, and is almost extinct in Uruguay. Its markings resemble those of foxes, but it is neither a fox nor a wolf. It is the only species in the genus Chrysocyon.

<span class="mw-page-title-main">Mule deer</span> Deer indigenous to western North America

The mule deer is a deer indigenous to western North America; it is named for its ears, which are large like those of the mule. Two subspecies of mule deer are grouped into the black-tailed deer.

<span class="mw-page-title-main">Geoffroy's cat</span> Small wild cat

Geoffroy's cat is a small wild cat native to the southern and central regions of South America. It is about the size of a domestic cat. It is listed as Least Concern on the IUCN Red List because it is widespread and abundant over most of its range.

<span class="mw-page-title-main">Southern red muntjac</span> Barking deer (Muntiacus muntjak)

The Southern red muntjac is a deer species native to Southeast Asia. It is formely known as the Indian muntjac or the common muntjac before the species was taxonomically revised to represent only populations of Sunda and perhaps Malaysia. The other populations being attributed to this species are now attributed to Muntiacus vaginalis. Muntjacs are also referred to as barking deer. It is listed as Least Concern on the IUCN Red List.

<span class="mw-page-title-main">Pampas fox</span> Species of carnivore

The Pampas fox, also known as grey pampean fox, Pampas zorro, Azara's fox, or Azara's zorro, is a medium-sized zorro, or "false" fox, native to the South American Pampas. Azara in some of its alternative common names is a reference to Spanish naturalist Félix de Azara.

<span class="mw-page-title-main">Brocket deer</span> Species of deer in the genus Mazama

Brockets or brocket deer are the species of deer in the genus Mazama. They are medium to small in size, and are found in the Yucatán Peninsula, Central and South America, and the island of Trinidad. Most species are primarily found in forests. They are superficially similar to the African duikers and the Asian muntjacs, but only distantly related. About 10 species of brocket deer are described.

<span class="mw-page-title-main">Marsh deer</span> Species of mammals belonging to the deer, muntjac, roe deer, reindeer, and moose family of ruminants

The marsh deer is the largest deer species from South America reaching a length of 2 m (6.6 ft) and a shoulder height of 1.2 m (3.9 ft). It is found in Argentina, Bolivia, Peru, Brazil, Uruguay and Paraguay. Formerly found in much of tropical and subtropical South America, it ranged east of the Andes, south from the Amazon rainforest, west of the Brazilian Atlantic rainforest and north of the Argentinian Pampa. Today it is largely reduced to isolated populations at marsh and lagoon zones in the Paraná, Paraguay, Araguaia and Guapore river basins. Small populations also occur in the southern Amazon, including Peru where protected in Bahuaja-Sonene National Park. It is listed as a vulnerable species by the IUCN and is protected under CITES Appendix I. Ths is the only species in the genus Blastocerus.

<span class="mw-page-title-main">Gray brocket</span> Species of deer

The gray brocket, also known as the brown brocket, is a species of brocket deer from northern Argentina, Bolivia, southern Peru, eastern and southern Brazil, Paraguay, and Uruguay. It formerly included the Amazonian brown brocket and sometimes also the Yucatan brown brocket as subspecies. Unlike other species of brocket deer in its range, the gray brocket has a gray-brown fur without reddish tones.

<span class="mw-page-title-main">White-bellied musk deer</span> Species of mammal

The white-bellied musk deer or Himalayan musk deer is a musk deer species occurring in the Himalayas of Nepal, Bhutan, India, Pakistan and China. It is listed as endangered on the IUCN Red List because of overexploitation resulting in a probable serious population decline.

<span class="mw-page-title-main">Philippine deer</span> Species of deer

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<span class="mw-page-title-main">Uruguayan savanna</span> Terrestrial ecoregion in South America

The Uruguayan savanna, also known as the Brazilian-Uruguayan savanna, is a subtropical grassland and savanna ecoregion which includes all of Uruguay and southernmost Brazil, along with portions of Argentina along the Uruguay River. In Brazil, this ecoregion is known as Pampas.

<span class="mw-page-title-main">South Andean deer</span> Species of deer

The south Andean deer, also known as the southern guemal, south Andean huemul, southern huemul, or Chilean huemul or güemul, is an endangered species of deer native to the mountains of Argentina and Chile. Along with the northern guemal or taruca, it is one of the two mid-sized deer in the Hippocamelus genus and ranges across the high mountainsides and cold valleys of the Andes. The distribution and habitat, behaviour, and diet of the deer have all been the subject of study. The viability of the small remaining population is an outstanding concern to researchers.

<span class="mw-page-title-main">Black musk deer</span> Species of mammal

The black musk deer or dusky musk deer is a species of even-toed ungulate in the family Moschidae. It is found in Bhutan, China, India, Myanmar, and Nepal.

<span class="mw-page-title-main">Java mouse-deer</span> Species of mammal

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<span class="mw-page-title-main">Pronghorn</span> Species of North American hoofed mammal

The pronghorn is a species of artiodactyl 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 and prairie antelope, because it closely resembles the antelopes of the Old World and fills a similar ecological niche due to parallel evolution. It is the only surviving member of the family Antilocapridae.

The fauna of Uruguay is a part of the wildlife of Uruguay.

<span class="mw-page-title-main">Iberá National Park</span> National park in Argentina

Iberá National Park is a national park in Argentina located in the northeast province of Corrientes. The national park adjoins the 5,530 km² Iberá Provincial Park to the southeast. The national park and provincial park are both within the Iberá Provincial Nature Reserve, a conservation area of 13,245 km² created in 1982. The combined protected area is the largest in Argentina.


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Further reading