Fourteen orangutans have been given full health examinations as Thai vets prepare to repatriate them to their country of origin, Indonesia.

Some of the apes were seized from smugglers, but most of the endangered Sumatran and Borneo-Kalimantan orangutans were confiscated from entertainment businesses.

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A two-year-old orangutan reacts as vets from the Department of National Park Wildlife and Plant Conservation collect blood at Kao Pratubchang Conservation Centre in Ratchaburi, ThailandAthit Perawongmetha/Reuters

After the apes were put to sleep, vets examined their teeth and took blood and hair samples to test for diseases such as rabies, foot and mouth disease, tuberculosis, hepatitis and herpes.

Banpot Malihuan, head of Kao Pratubchang Conservation Centre, said the orangutans will be kept in quarantine to ensure they don't come into contact with any diseases before they are returned to Indonesia in September.

The orangutans also have their fingerprints taken and undergo DNA tests to ascertain their species and country of origin.

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Vets photograph a young female orangutan during a health examinationAthit Perawongmetha/Reuters
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Thai veterinarians collect the fingerprints of an orangutan during a health examination at Kao Pratubchang Conservation CentreAthit Perawongmetha/Reuters
thailand orangutans
A wildlife officer looks at orangutans in a cage before they undergo a health examination at Kao Pratubchang Conservation CentreAthit Perawongmetha/Reuters
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Thai veterinarians take a young orangutan's fingerprintsAthit Perawongmetha/Reuters
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An orangutan has its skull measured during a health examination at Kao Pratubchang Conservation CentreAthit Perawongmetha/Reuters
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Wildlife officers weigh an orangutan at Kao Pratubchang Conservation CentreAthit Perawongmetha/Reuters
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An orangutan is carried on a stretcher by Thai veterinarians and wildlife officers after a health examinationAthit Perawongmetha/Reuters
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A young orangutan hugs its mother as she recovers from her health examinationAthit Perawongmetha/Reuters
thailand orangutans
An orangutan waits in an enclosure at Kao Pratubchang Conservation Centre in RatchaburiAthit Perawongmetha/Reuters
thailand orangutans
A two-year-old orangutan looks on as vets draw bloodAthit Perawongmetha/Reuters

Thailand has several theme parks that stage controversial attractions such as Thai boxing matches between orangutans. Safari World in Bangkok is home to a troupe of apes dressed in silky boxing shorts and bright red gloves pretending to slug it out to the delight of tourists.

Conservation officials from Jakarta claimed the animals were trafficked from Indonesia, but Safari World's owners said they were acquired through the proper channels, or bred in captivity. These shows were banned during an investigation, but the amusement park's website still advertises the fights.

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An orangutan displays the round number during the Thai boxing show at Safari World animal park, in 2004Pornchai Kittiwongsakul/AFP
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An orangutan dances on a car during a kickboxing show at Safari World wildlife park in Bangkok, in 2004Pornchai Kittiwongsakul/AFP
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An orangutan raises his arm after "knocking out" another ape during a kickboxing match at a theme park in Bangkok in 2003Sukree Sukplang/Reuters

There are thought to be around 5,000 Sumatran and 40,000 Borneo-Kalimantan orangutans in the wild today. They are found in the jungles of Malaysia and Indonesia, but their habitat is under threat as forests are cut down to make way for palm oil plantations. Many experts believe orangutans could be extinct from the wild in less than 25 years.