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In 2000, after finally succumbing to hunting, loss of habitat, climate change and war, the scimitar-horned oryx was declared extinct in the wild.

In 1985 Marwell and Edinburgh zoo sent 10 scimitar-horned oryx from their collections to the Bou Hedma National Park in Tunisia as part of a re-release programme. An area within this park had dramatically recovered its natural vegetation due to extensive work keeping it free from domestic livestock. 

A newborn dama gazelle the San Antonio Zoo in August 1999. A new federal law placing dama gazelle and two other endangered African antelope under protection of the Endangered Species Act went into effect

A newborn dama gazelle the San Antonio Zoo in August 1999. A new federal law placing dama gazelle and two other endangered African antelope under protection of the Endangered Species Act went into effect Wednesday, April 4, 2012.

Some ranchers will apply for permits and continue offering the three antelope for hunts, said Texas biologist Elizabeth Mungall, the author of a book on the state's exotic wildlife. She said many won't, however, because of the bureaucracy involved and because of the government intrusion it will entail.

Its horns, sometimes up to 4 feet long, arc gracefully over its back, almost reaching its hindquarters when it lifts its head to sniff the wind.

The myth of the one-horned unicorn may have originated from sightings of injured scimitar oryx; Aristotle and Pliny the Elder held that the oryx was the unicorn's "prototype".[32] From certain angles, the oryx may seem to have one horn rather than two,[33][34] and given that its horns are made from hollow bone that cannot be regrown, if an oryx were to lose one of its horns, for the rest of its life it would have only one.[32]

Within its first hour of life, a scimitar-horned oryx calf will stand, take its first steps and have its first feed from the mother. The calf will hide in tall grass with its mother close by, until it is old enough to join the herd. If there are other calves of similar age, they will often form a crèche and stay close to each other. The young are fully weaned by 5 to 10 months.

That exemption was successfully challenged by Friends of Animals, and it disappears Wednesday.

An addax grazes in the tall grass on Helen Girault's ranch located off U.S. 100, in Bayview, in September 2002. A new federal law placing the addax and two other endangered African antelope under protection of the Endangered Species Act went into effect Wednesday, April 4, 2012.

The scimitar-horned oryx, so named for its magnificent curved horns, is now thought to be Extinct in the Wild, hunted to the brink of extinction for its meat and exceptionally robust hide (4). The stocky body is a pale colour, with brown markings on the face and a reddish-brown neck and chest area (5). The large, spread hooves allow these antelope to walk on the sand of their dry habitat (6).

“These permits will allow the government to come onto their private property at any time, unannounced for inspection,” she said.

At the same time, however, the U.S. Fish and Wildlife Service granted an exemption from certain provisions of the act relating to the “taking” — or hunting — and transportation of the animals, essentially maintaining the status quo.

Similar to other antelope species, the scimitar-horned oryx will use its keen eyesight to look out for danger; being in a herd allows for more individuals to look out for potential threats. When threatened, they will give an alarm call and will run away from the threat. However if they are cornered, they will use their large horns to protect themselves.

Vast herds of them once roamed the semi-arid plains of North Africa and the Sahel, from the Atlantic Ocean to the Red Sea.

The breeding age of these animals is around 2 years for females, 3-4 years for males. Breeding can occur all year round, but most births in captive populations occur from March to October. The female would separate from the herd to give birth to a single calf, and return to the herd soon after.

In 1999 and 2007, Marwell coordinated the release of more scimitar-horned oryx.  Two projects in 1999 included animals from other European institutions and the project in 2007 included animals from North America for the first time. 

Over-hunting is the primary cause of population decline and extinction in the wild. Other factors, such as habitat loss and compteition with domestic livestock for food have contributed as well. Scimitar-horned oryx are well-equipped to deal with drought, but not under extreme hunting pressure and competition with domestic livestock.

Browsing in the relative cool of the early morning and evening (6), these oryx feed on a wide range of grass species, foliage and fruit (9) (10).

Already, ahead of the implementation of the new rules, ranchers have been escalating hunts and selling off their stocks of the three species before the bottom drops out of the market.

In Kerrville, taxidermist Gary Broach normally sees maybe 10 to 12 scimitar-horned oryx come into his shop for processing and mounting in a year; in the last 28 days, 23 have come in for full-head mounting, and at least 17 others for lesser treatments.

The play activity of eight calves in captivity was observed in a 1983 study. Male calves played for longer than females calves did. Mixed sex play was usual; selection of partners depended on age, but not on sex or genetic relatedness. Results suggested that size dimorphism was an important factor responsible for sex differences in play.[22]

Without the unfettered ability to hunt, breed and trade these animals, ranchers say they will lose the economic incentive to maintain the herds, and whatever gains have been made in restoring their numbers will be lost.

The scimitar oryx is a straight-horned antelope that stands just over 1 m (3.3 ft) at the shoulder. The males weigh 140–210 kg (310–460 lb) and the females 91–140 kg (201–309 lb).[9] The body measures 140–240 cm (55–94 in) from the head to the base of the tail. The tail is 45–60 cm (18–24 in) long and ends with a tuft. They are sexually dimorphic with males being larger than females.[10]

J. David Bamberger, a celebrated Texas conservationist who pioneered the growth of the Texas scimitar-horned oryx herd in the late 1970s on his Hill Country ranch, said the initial oryx breeding program was started by the Association of Zoos and Aquariums in an attempt to maintain the genetic diversity of those few animals then in captivity.

Classified as Extinct in the Wild (EW) on the IUCN Red List 2007 (1). Listed on Appendix I of CITES and Appendices I and II of The Convention on Migratory Species (CMS or Bonn Convention) (3).

Scimitar-horned oryx are able to survive 9 to 10 months without water.

Until the late 1970’s it was estimated that there were several thousand scimitar-horned oryx found in Chad and Niger. However, civil war in Chad combined with drought and increased poaching in Niger devastated the wild population of the scimitar-horned oryx.

By any measure, those gains have been impressive. In 1979, according to the Texas-based Exotic Wildlife Association, there were 32 scimitar-horned oryx in a captive breeding program in Texas; today there are more than 11,000. Only two addax were known to exist in the state in 1971; today there are more than 5,000. And the number of dama gazelle has increased from nine individuals in 1979 to more than 800 today.

Size Head and body length: 160-175cm. Tail length: 60cm

That battle is lost Wednesday, Texas ranchers fear, when the scimitar-horned oryx and two of its African cousins, the addax and the dama gazelle, officially receive full protection under the Endangered Species Act.

Scimitar Oryx

“It's a private property issue, and hunting is a management tool,” Seale said. “There is no slaughter market for these animals. Hunting gives them value. A certain percentage of them (ranchers) will get the permits, but I think less than 10 percent will.”

A 1983 study examined the blood serum chemistry of blood samples taken from the jugular veins of fifty scimitar oryx ranging from neonates to adults over 13 years old. The study concluded that the higher eosinophil counts of the juveniles and adults might reflect larger internal parasite burdens in them as compared with the neonates.[21]

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Friends of Animals, a Connecticut-based animal-rights organization adamantly opposed to hunting, has been fighting for more than two decades to have the three species listed on the national Endangered Species Act. In 2005, it succeeded.

The number of scimitar-horned oryx at the Natural Bridge Wildlife Ranch, seen in March 2003, may outnumber those in the wild. A new federal law placing scimitar-horned oryx and two other endangered African

True, altruism is not to be entirely credited with the meteoric rise in the numbers of scimitar-horned oryx, addax and dama gazelle in Texas. Its about making money, and if it becomes difficult to hunt them, their value declines, and there are plenty of other desirable exotic species on Texas ranches — between 80 and 125, depending on how you count them — to take up the slack.

In another study, intended to note genetic differences between Oryx species, karyotypes of Oryx species and subspecies – namely O. gazella, O. b. beisa, O. b. callotis, O. dammah and O. leucoryx – were compared with the standard karyotype of Bos taurus. The number of autosomes in all karyotypes was 58. The X and Y chromosomes were conserved in all five species.[8]