A proboscis monkey (Nasalis larvatus) or long-nosed monkey is seen in a mangrove forest in Tarakan, North Kalimantan province, Indonesia, October 20, 2021. REUTERS/Willy Kurniawan 

A proboscis monkey (Nasalis larvatus) or long-nosed monkey is seen in a mangrove forest in Tarakan, North Kalimantan province, Indonesia, October 20, 2021. REUTERS/Willy Kurniawan 

Veterinary surgeons inspect Julau, a 9-year old male Proboscis monkey, after it was sedated during a routine health inspection at the Singapore Zoo July 5, 2011.Three Proboscis monkeys are undergoing checkups ahead of being sent to Apenheul Primate Park in the Netherlands as part of an animal exchange to kick start a captive breeding programme. The zoo in Singapore is the first wildlife reserve to successfully breed Proboscis monkeys in a captive environment, according to an official. REUTERS/Joel Boh (SINGAPORE - Tags: ANIMALS SOCIETY) 

A vet holds Bena, a 11-year old male Proboscis monkey, during a routine health inspection at the Singapore Zoo in Singapore July 5, 2011. Three Proboscis monkeys are undergoing checkups in preparation to be sent to Apenheul Primate Park in the Netherlands as part of an animal exchange to kick start a captive breeding programme. The zoo in Singapore is the first wildlife reserve to successfully breed Proboscis monkeys in a captive environment, according to an official. REUTERS/Joel Boh (SINGAPORE - Tags: ANIMALS SOCIETY) 

Bena, a 11-year old male Proboscis monkey, lies on the operating table after it was sedated for a routine health inspection at the Singapore Zoo in Singapore July 5, 2011. Three Proboscis monkeys are undergoing checkups ahead of being sent to Apenheul Primate Park in the Netherlands as part of an animal exchange to kick start a captive breeding programme. The zoo in Singapore is the first wildlife reserve to successfully breed Proboscis monkeys in a captive environment, according to an official. REUTERS/Joel Boh (SINGAPORE - Tags: ANIMALS SOCIETY) 

Vets prepare to conduct an X-ray for Bena, a 11-year old male Proboscis monkey, after it was sedated for a routine health inspection at the Singapore Zoo in Singapore July 5, 2011. Three Proboscis monkeys are undergoing checkups ahead of being sent to Apenheul Primate Park in the Netherlands as part of an animal exchange to kick start a captive breeding programme. The zoo in Singapore is the first wildlife reserve to successfully breed Proboscis monkeys in a captive environment, according to an official. REUTERS/Joel Boh (SINGAPORE - Tags: ANIMALS SOCIETY) 

Vets prepare to conduct an X-ray for Bena, a 11-year old male Proboscis monkey, after it was sedated for a routine health inspection at the Singapore Zoo in Singapore July 5, 2011. Three Proboscis monkeys are undergoing checkups ahead of being sent to Apenheul Primate Park in the Netherlands as part of an animal exchange to kick start a captive breeding programme. The zoo in Singapore is the first wildlife reserve to successfully breed Proboscis monkeys in a captive environment, according to an official. REUTERS/Joel Boh (SINGAPORE - Tags: ANIMALS SOCIETY) 

A vet prepares to administer an injection to Julau, a 9-year old male Proboscis monkey, after it was sedated for a routine health inspection in the operating room at the Singapore Zoo in Singapore July 5, 2011. Three Proboscis monkeys are undergoing checkups ahead of being sent to Apenheul Primate Park in the Netherlands as part of an animal exchange to kick start a captive breeding programme. The zoo in Singapore is the first wildlife reserve to successfully breed Proboscis monkeys in a captive environment, according to an official. REUTERS/Joel Boh (SINGAPORE - Tags: ANIMALS SOCIETY) 

A vet holds Julau, a 9-year old male Proboscis monkey, after it was sedated for a routine health inspection in the operating room at the Singapore Zoo in Singapore July 5, 2011. Three Proboscis monkeys are undergoing checkups ahead of being sent to Apenheul Primate Park in the Netherlands as part of an animal exchange to kick start a captive breeding programme. The zoo in Singapore is the first wildlife reserve to successfully breed Proboscis monkeys in a captive environment, according to an official. REUTERS/Joel Boh (SINGAPORE - Tags: ANIMALS SOCIETY) 

A vet places a stethoscope on Julau, a 9-year old male Proboscis monkey, before taking an X-ray during a routine health inspection at the Singapore Zoo in Singapore July 5, 2011. Three Proboscis monkeys are undergoing checkups ahead of being sent to Apenheul Primate Park in the Netherlands as part of an animal exchange to kick start a captive breeding programme. The zoo in Singapore is the first wildlife reserve to successfully breed Proboscis monkeys in a captive environment, according to an official. REUTERS/Joel Boh (SINGAPORE - Tags: ANIMALS SOCIETY) 

A DNA sample of a proboscis monkey, a threatened species, is displayed during a photo opportunity at the Preservation and Research Center in Yokohama, south of Tokyo October 25, 2010.The facility, located at the breeding zone of Yokohama Zoological Gardens, is closed to the public to allow the selected endangered species to breed in the most suitable environment and to study the endangered animals, according to the center. Negotiators from over 190 countries are gathered in Nagoya, Japan for a United Nations meeting to discuss ways to fight rising extinctions of plants and animals from pollution, climate change and habitat loss. REUTERS/Yuriko Nakao (JAPAN - Tags: ENVIRONMENT POLITICS SOCIETY) 

A proboscis monkey sits on a tree trunk at the Singapore Zoo June 4, 2009. The Singapore Zoo has been responsible for the successful births of 17 proboscis monkeys since its opening in 1973. REUTERS/David Yeo (SINGAPORE ENVIRONMENT ANIMALS) 

A proboscis monkey feeds at the Singapore Zoo June 4, 2009. The Singapore Zoo has been responsible for the successful births of 17 proboscis monkeys since its opening in 1973. REUTERS/David Yeo (SINGAPORE ENVIRONMENT ANIMALS) 

A proboscis monkey feeds at the Singapore Zoo June 4, 2009. The Singapore Zoo has been responsible for the successful births of 17 proboscis monkeys since its opening in 1973. REUTERS/David Yeo (SINGAPORE ENVIRONMENT ANIMALS) 

A proboscis monkey feeds at the Singapore Zoo June 4, 2009. The Singapore Zoo has been responsible for the successful births of 17 proboscis monkeys since its opening in 1973. REUTERS/David Yeo (SINGAPORE ENVIRONMENT ANIMALS) 

A proboscis monkey feeds at the Singapore Zoo June 4, 2009. The Singapore Zoo has been responsible for the successful births of 17 proboscis monkeys since its opening in 1973. REUTERS/David Yeo (SINGAPORE ENVIRONMENT ANIMALS) 

A proboscis monkey rests on a branch at the Singapore Zoo June 4, 2009. The Singapore Zoo has been responsible for the successful births of 17 proboscis monkeys since its opening in 1973. REUTERS/Amirah Fatin (SINGAPORE) 

A group of young proboscis monkeys gather on a tree along the Kinabatangan River in Sukau in Malaysia's state of Sabah on the Borneo island February 19, 2009. REUTERS/Bazuki Muhammad (MALAYSIA) 

A proboscis monkey sits on a tree trunk along the Kinabatangan River in Sukau in Malaysia's state of Sabah on the Borneo island February 19, 2009. REUTERS/Bazuki Muhammad (MALAYSIA) 

Victo, a 10-year-old male Proboscis monkey (Nasalis larvatus), pauses during an afternoon token feeding session at the Singapore Zoo September 4, 2006. REUTERS/Tim Chong (SINGAPORE) 

Intan, a two-month-old Proboscis monkey (Nasalis larvatus), plays in her enclosure at the Singapore Zoo September 4, 2006. REUTERS/Tim Chong (SINGAPORE) 

Intan, a two-months-old Proboscis monkey (Nasalis larvatus), plays in her enclosure at the Singapore Zoo September 4, 2006. REUTERS/Tim Chong (SINGAPORE) 

Victo, a 10-year-old male Proboscis monkey (Nasalis larvatus), pauses during an afternoon token feeding session at the Singapore Zoo September 4, 2006. REUTERS/Tim Chong (SINGAPORE) 

Putri, a two-week-old baby Proboscis monkey (Nasalis larvatus), locally known as Bekantan, is carried by his mother Sintia at the Taman Safari park in Bogor, West Java on October 24, 2004. 

Putri, a two-week-old baby Proboscis monkey (Nasalis larvatus), locally known as Bekantan, is carried by his mother Sintia while male proboscis monkey Boki (R) looks on at the Taman Safari park in Bogor, West Java on October 24, 2004. 

Putri, a two-week-old baby Proboscis monkey (Nasalis larvatus), locally known as Bekantan, is carried by his mother Sintia while male proboscis monkey Boki (R) looks on at the Taman Safari park in Bogor, West Java on October 24, 2004. 

Putri, a two-week-old baby Proboscis monkey (Nasalis larvatus) is carried by his mother Sintia at the Taman Safari park in Bogor. Putri, a two-week-old baby Proboscis monkey (Nasalis larvatus), locally known as Bekantan, is carried by his mother Sintia at the Taman Safari park in Bogor, West Java on October 24, 2004. REUTERS/Supri PP04110066 

Putri, a two-week-old baby Proboscis monkey (Nasalis larvatus) is carried by his mother Sintia at the Taman Safari park in Bogor. Putri, a two-week-old baby Proboscis monkey (Nasalis larvatus), locally known as Bekantan, is carried by his mother Sintia while male proboscis monkey Boki (R) looks on at the Taman Safari park in Bogor, West Java on October 24, 2004. REUTERS/Supri 

Putri, a two-week-old baby Proboscis monkey (Nasalis larvatus) is carried by his mother Sintia at the Taman Safari park in Bogor. Putri, a two-week-old baby Proboscis monkey (Nasalis larvatus), locally known as Bekantan, is carried by his mother Sintia while male proboscis monkey Boki (R) looks on at the Taman Safari park in Bogor, West Java on October 24, 2004. REUTERS/Supri 

A female proboscis monkey in the Singapore zoo January 21, 2004. 

A male proboscis monkey in the Singapore zoo January 21, 2004. 

A female proboscis mokey in the Singapore zoo January 21, 2004. REUTERS/Thomas White TW 

A male proboscis monkey in the Singapore zoo January 21, 2004. REUTERS/Thomas White TW 

A male Proboscis monkey named Victor relaxes at the Singapore Zoo January 13, 2004. The Singapore Zoo is home to the only breeding group of the highly endangered monkeys in captivity today and Victor has squired eight offspring since 1998. The Chinese New Year, the Year of the Monkey will be ushered in with great fanfare and celebration on January 22. REUTERS/Bob Strong RCS/TW 

Tourists watch a family of rare Asian elephants feeding on the banks of
the Kinabatangan river, which runs through the East Malaysian state of
Sabah on Borneo island. Ecotourism advocates say revenues from visitors
drawn to see the proboscis monkeys and Asian elephants living along the
forested riverbanks could rival money made from expanding oil palm
estates, which threaten the animals' habitat. Picture taken October 2,
2002. REUTERS/Patrick Chalmers TO ACCOMPANY FEATURE
ENVIRONMENT-MALAYSIA

PC/CP 

Tourists travel towards a commercial tug and barge steaming up the
Kinabatangan river towards an oil palm estate on the East Malaysian
state of Sabah on Borneo island. Ecotourism advocates say revenues from
visitors drawn to see the rare proboscis monkeys and Asian elephants
living along the forested river banks could rival money made from
expanding oil palm estates, which threaten the animals' habitat.
Picture taken October 2, 2002. REUTERS/Patrick Chalmers TO ACCOMPANY
FEATURE ENVIRONMENT-MALAYSIA

PC/CP