29-year-old Pygmy hippopotamus Kuma eats fruits and vegetables at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman

29-year-old Pygmy hippopotamus Kuma eats fruits and vegetables at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman

29-year-old Pygmy hippopotamus Kuma eats fruits and vegetables at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman

29-year-old Pygmy hippopotamus Kuma eats fruits and vegetables at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman

Emilio, a pygmy hippopotamus, is sprayed with water to cool down on a hot summer day at Sofia City Zoo, Sofia, Bulgaria June 23, 2017. REUTERS/Stoyan Nenov TPX IMAGES OF THE DAY

Nimba, a five-month-old baby female pygmy hippopotamus (Choeropsis liberiensis), swims in the enclosure at Bioparc Fuengirola in Fuengirola, near Malaga, southern Spain, February 8, 2017. REUTERS/Jon Nazca

Nimba, a five-month-old baby female pygmy hippopotamus (Choeropsis liberiensis), plays with her mother Liberia in the enclosure at Bioparc Fuengirola in Fuengirola, near Malaga, southern Spain, February 8, 2017. REUTERS/Jon Nazca

Nimba, a five-month-old baby female pygmy hippopotamus (Choeropsis liberiensis), tries to eat with her mother Liberia in the enclosure at Bioparc Fuengirola in Fuengirola, near Malaga, southern Spain, February 8, 2017. REUTERS/Jon Nazca

Nimba, a five-month-old baby female pygmy hippopotamus (Choeropsis liberiensis), plays with her mother Liberia in the enclosure at Bioparc Fuengirola in Fuengirola, near Malaga, southern Spain, February 8, 2017. REUTERS/Jon Nazca

Nimba, a five-month-old baby female pygmy hippopotamus (Choeropsis liberiensis), swims in the enclosure at Bioparc Fuengirola in Fuengirola, near Malaga, southern Spain, February 8, 2017. REUTERS/Jon Nazca

Nimba, a five-month-old baby female pygmy hippopotamus (Choeropsis liberiensis), bites her mother Liberia in the enclosure at Bioparc Fuengirola in Fuengirola, near Malaga, southern Spain, February 8, 2017. REUTERS/Jon Nazca

Nimba, a five-month-old baby female pygmy hippopotamus (Choeropsis liberiensis), swims in the enclosure at Bioparc Fuengirola in Fuengirola, near Malaga, southern Spain, February 8, 2017. REUTERS/Jon Nazca

Nimba, a five-month-old baby female pygmy hippopotamus (Choeropsis liberiensis), is seen in the enclosure at Bioparc Fuengirola in Fuengirola, near Malaga, southern Spain, February 8, 2017. REUTERS/Jon Nazca

Sapo, a three month old male pygmy hippo tries to eat a shrub while swimming for the first time at Whipsnade Zoo near Dunstable, southern England June 7, 2011. When fully grown, Sapo will reach one metre in height and weigh over 250 kg. REUTERS/Chris Helgren (BRITAIN - Tags: ANIMALS ENVIRONMENT)

Zookeeper Marie Whatmough tries to hold a gate shut against three month old pygmy hippo Sapo and his mother Flora in an enclosure at Whipsnade Zoo near Dunstable, southern England June 7, 2011. When fully grown, Sapo will reach one metre in height and weigh over 250 kg. REUTERS/Chris Helgren (BRITAIN - Tags: ANIMALS ENVIRONMENT)

Sapo, a three month old male pygmy hippo is coaxed from a pond by his mother Flora after swimming for the first time at Whipsnade Zoo near Dunstable, southern England June 7, 2011. When fully grown, Sapo will reach one metre in height and weigh over 250 kg. REUTERS/Chris Helgren (BRITAIN - Tags: ANIMALS ENVIRONMENT)

A month-old Pygmy Hippopotamus calf known as "Kambiri" stands under her mother "Petre" as they explore their enclosure at Taronga Zoo in Sydney August 5, 2010. Zoo officials say Kambiri is the first Pygmy Hippo calf reared at the zoo in 20 years. REUTERS/Tim Wimborne (AUSTRALIA - Tags: ENVIRONMENT ANIMALS)

A month-old Pygmy Hippopotamus calf known as "Kambiri" stands behind her mother "Petre" as they explore their enclosure at Taronga Zoo in Sydney August 5, 2010. Zoo officials say Kambiri is the first Pygmy Hippo calf reared at the zoo in 20 years. REUTERS/Tim Wimborne (AUSTRALIA - Tags: ENVIRONMENT ANIMALS IMAGES OF THE DAY)

A Pygmy Hippopotamus known as "Petre" eats lettuce and carrots in her enclosure at Taronga Zoo in Sydney August 5, 2010. REUTERS/Tim Wimborne (AUSTRALIA - Tags: ENVIRONMENT ANIMALS)

A month-old Pygmy Hippopotamus calf known as "Kambiri" explores her enclosure at Taronga Zoo in Sydney August 5, 2010. Zoo officials say Kambiri is the first Pygmy Hippo calf reared at the zoo in 20 years. REUTERS/Tim Wimborne (AUSTRALIA - Tags: ENVIRONMENT ANIMALS)

Zookeeper Yudy checks the teeth of a pygmy hippopotamus (Choeropsis liberiensi) before feeding it inside an enclosure at the Singapore Zoo January 29, 2010. The pygmy hippopotamus is considered endangered by the International Union for Conservation of Nature (IUCN). REUTERS/Tim Chong (SINGAPORE - Tags: ANIMALS SOCIETY)

A pygmy hippopotamus (Choeropsis liberiensi) opens its mouth as it waits to be fed inside its enclosure at the Singapore Zoo January 29, 2010. The pygmy hippopotamus is considered endangered by the International Union for Conservation of Nature (IUCN). REUTERS/Tim Chong (SINGAPORE - Tags: ANIMALS SOCIETY IMAGES OF THE DAY)

A baby pygmy hippopotamus walks next to her mother in their enclosure at Ueno Zoo in Tokyo July 11, 2009. The pygmy hippopotamus are only found in West Africa and the World Conservation Union estimates that there are fewer than 3,000 remaining. REUTERS/Yuriko Nakao (JAPAN ANIMALS)

A baby pygmy hippopotamus walks towards her mother in their enclosure at Ueno Zoo in Tokyo July 11, 2009. The pygmy hippopotamus are only found in West Africa and the World Conservation Union estimates that there are fewer than 3,000 remaining. REUTERS/Yuriko Nakao (JAPAN ANIMALS)

A baby pygmy hippopotamus sits next to her mother in their enclosure at Ueno Zoo in Tokyo July 11, 2009. The pygmy hippopotamus are only found in West Africa and the World Conservation Union estimates that there are fewer than 3,000 remaining. REUTERS/Yuriko Nakao (JAPAN ANIMALS)

Leishan, a baby pygmy hippopotamus, sits in the water next to her mother Ellen in their enclosure at Edinburgh Zoo in Scotland July 2, 2009. Leishan, a West African name meaning 'gift', was born on the 9th May and is the first offspring for parents Ellen and Otto. Pygmy hippos are only found in West Africa,where they are critically endangered. REUTERS/David Moir (BRITAIN SOCIETY ENVIRONMENT ANIMALS)

Leishan, a baby pygmy hippopotamus, sits in the water next to her mother Ellen in their enclosure at Edinburgh Zoo in Scotland July 2, 2009. Leishan, a West African name meaning 'gift', was born on the 9th May and is the first offspring for parents Ellen and Otto. Pygmy hippos are only found in West Africa,where they are critically endangered. REUTERS/David Moir (BRITAIN SOCIETY ENVIRONMENT ANIMALS)

Leishan, a baby pygmy hippopotamus, sits in the water next to her mother Ellen in their enclosure at Edinburgh Zoo in Scotland July 2, 2009. Leishan, a West African name meaning 'gift', was born on the 9th May and is the first offspring for parents Ellen and Otto. Pygmy hippos are only found in West Africa,where they are critically endangered. REUTERS/David Moir (BRITAIN SOCIETY ENVIRONMENT ANIMALS)

Zookeeper Renae Zammit takes care of Monifa, a three-week-old pygmy hippopotamus, in its enclosure at Taronga Zoo in Sydney November 7, 2008. Monifa was born on October 15 after a difficult breach birth and zookeepers made the decision to intervene and raise the female calf. REUTERS/Daniel Munoz (AUSTRALIA)

Zookeepers feed Monifa, a three-week-old pygmy hippopotamus, in its enclosure at Taronga Zoo in Sydney November 7, 2008. Monifa was born on October 15 after a difficult breach birth and zookeepers made the decision to intervene and raise the female calf. REUTERS/Daniel Munoz (AUSTRALIA)

Zookeepers feed Monifa, a three-week-old pygmy hippopotamus, in its enclosure at Taronga Zoo in Sydney November 7, 2008. Monifa was born on October 15 after a difficult breach birth and zookeepers made the decision to intervene and raise the female calf. REUTERS/Daniel Munoz (AUSTRALIA)

Monifa, a three-week-old pygmy hippopotamus, takes a bath in its enclosure at Taronga Zoo in Sydney November 7, 2008. Monifa was born on October 15 after a difficult breach birth and zookeepers made the decision to intervene and raise the female calf. REUTERS/Daniel Munoz (AUSTRALIA)

Zookeeper Renae Zammit holds Monifa, a three-week-old pygmy hippopotamus, in its enclosure at Taronga Zoo in Sydney November 7, 2008. Monifa was born on October 15 after a difficult breach birth and zookeepers made the decision to intervene and raise the female calf. REUTERS/Daniel Munoz (AUSTRALIA)

Monifa, a three-week-old pygmy hippopotamus, walks in its enclosure at Taronga Zoo in Sydney November 7, 2008. Monifa was born on October 15 after a difficult breach birth and zookeepers made the decision to intervene and raise the female calf. REUTERS/Daniel Munoz (AUSTRALIA)

Waluh, a one-day-old male baby pygmy hippopotamus (Cheropsis libereensis), swims with his mother at Gembiraloka Zoo in Yogyakarta, in Central Java November 12, 2005. Waluh was the second child born to the same mother and has increased the number of hippos in the zoo became to five. REUTERS/Dwi Oblo

CAPTION CLARIFICATION - Bono, a 17-day-old male baby pygmy hippopotamus (Hexaprotodon liberiensis), stays close to its mother, 10-year-old Tina, at Taman Safari Park in Bogor, West Java July 29, 2005. Bono weighed 15kg at birth and is the second calf of Tina. REUTERS/Supri

Bono, a 17-day-old male baby pygmy hippopotamus (Hexaprotodon liberiensis), stays close to its mother, 10-year-old Tina, at Taman Safari Park in Bogor, West Java July 29, 2005. Bono weighed 15kg at birth and is the second calf of Tina. REUTERS/Supri

Bono, a 17-day-old male baby pygmy hippopotamus (Hexaprotodon liberiensis), stays close to its mother, 10-year-old Tina, at Taman Safari Park in Bogor, West Java July 29, 2005. Bono weighed 15kg at birth and is the second calf of Tina. REUTERS/Supri

A pigmy hippopotamus (hexaprotodon liberiensis) opens its mouth in its outdoor pen at the zoo of Zurich, July 20, 2005. [Pygmy hippos which range in Western Africa, specifically Liberia, Sierra Leone, Guinea, and Ivory Coast, live comfortably both in water and on land.]

A pigmy hippopotamus (hexaprotodon liberiensis) opens its mouth in its outdoor pen at the zoo of Zurich, July 20, 2005. Pygmy hippos which range in Western Africa, specifically Liberia, Sierra Leone, Guinea, and Ivory Coast, live comfortably both in water and on land. REUTERS/Sebastian Derungs STD/MR/CVI

A pigmy hippopotamus (hexaprotodon liberiensis) eyes its environment during a swim at the zoo of Zurich, July 20, 2005. Pygmy hippos which range in Western Africa, specifically Liberia, Sierra Leone, Guinea, and Ivory Coast, live comfortably both in water and on land. REUTERS/Sebastian Derungs STD/MR/CVI

A pigmy hippopotamus (hexaprotodon liberiensis) eyes its environment during a swim at the zoo of Zurich, July 20, 2005. Pygmy hippos which range in Western Africa, specifically Liberia, Sierra Leone, Guinea, and Ivory Coast, live comfortably both in water and on land. REUTERS/Sebastian Derungs REUTERS STD/MR/CVI

Pygmy Hippopotamus (Choeropsis liberiensis) swims under water beside his 8-year-old mother Debby at the Berlin Zoo January 21, 2005. The male calf, which has no name so far, is nearly eight weeks old and weighs some 20kg.

A girl watches a Pygmy Hippopotamus (Choeropsis liberiensis) through a glass window as it swims under water at the Berlin Zoo, January 21, 2005. The nearly eight weeks old male calf, son of 8-year-old mother Debby has no name so far and weighs some 20kg.

Pygmy Hippopotamus (Choeropsis liberiensis) swims under water beside his 8-year-old mother Debby at the Berlin Zoo January 21, 2005. The male calf, which has no name so far, is nearly eight weeks old and weighs some 20kg.

Pygmy Hippopotamus (Choeropsis liberiensis) swims under water beside his 8-year-old mother Debby at the Berlin Zoo January 21, 2005. The male calf, which has no name so far, is nearly eight weeks old and weighs some 20kg.

A Pygmy hippopotamus (Choeropsis liberiensis) swims under water beside his 8-year-old mother Debby at the Berlin Zoo January 21, 2005. The male calf, which has no name so far, is nearly eight weeks old and weighs some 20kg. REUTERS/Arnd Wiegmann AKW/JOH/ABP

A girl watches a Pygmy hippopotamus (Choeropsis liberiensis) through a glass window as it swims under water at the Berlin Zoo, January 21, 2005. The nearly eight weeks old male calf, son of 8-year-old mother Debby has no name so far and weighs some 20kg. REUTERS/Arnd Wiegmann AKW/JOH/ABP

Pygmy hippopotamus (Choeropsis liberiensis) swims under water beside his 8-year-old mother Debby at the Berlin Zoo January 21, 2005. The male calf, which has no name so far, is nearly eight weeks old and weighs some 20kg. REUTERS/Arnd Wiegmann AKW/JOH/ABP

Pygmy hippopotamus (Choeropsis liberiensis) swims under water beside his 8-year-old mother Debby at the Berlin Zoo, January 21, 2005. The male calf, which has no name so far, is nearly eight weeks old and weighs some 20kg. REUTERS/Arnd Wiegmann AKW/JOH/ABP

A rare and endangered seven-week-old pygmy hippopotamus swims in a pool on its first public appearance at Tokyo's Ueno zoo January 10, 2004. [The animal, found along rivers and swamps in dense forests in western Africa, numbers between 2,000 to 4,000 in the wild. ]

A seven-week-old pygmy hippopotamus swims in a pool with its mother on the baby's first public appearance at Tokyo's Ueno Zoo January 10, 2004. [The animal, found along rivers and swamps in dense forests in western Africa, numbers between 2,000 to 4,000 in the wild. ]

A seven-week-old pygmy hippopotamus swims in a pool with its mother on the baby's first public appearance at Tokyo's Ueno Zoo January 10, 2004. The rare and endangered Pygmy hippopotamus, found along rivers and swamps in dense forests in western Africa, number between 2,000 to 4,000 in the wild. REUTERS/Yuriko Nakao YN/DL

A rare and endangered seven-week-old pygmy hippopotamus and its mother swim in a pool on its first public appearance at Tokyo's Ueno zoo January 10, 2004. Pygmy hippopotamus, found along rivers and swamps in dense forests in western Africa, number between 2,000 to 4,000 in the wild. REUTERS/Yuriko Nakao YN

A rare and endangered seven-week-old pygmy hippopotamus swims in a pool on its first public appearance at Tokyo's Ueno zoo January 10, 2004. The animal, found along rivers and swamps in dense forests in western Africa, numbers between 2,000 to 4,000 in the wild. NO RIGHTS CLEARANCES OR PERMISSIONS ARE REQUIRED FOR THIS IMAGE REUTERS/Yuriko Nakao Pictures of the month January 2004 YN

A couple of pygmy hippopotamus named Mimi (four-year-old female) and Buba (five-year-old male) eat at the Buenos Aires zoo, April 19. The pygmy hippopotamus, are 1,60 m (4.8 ft ) long, 0,90 m ( 3.3 ft ) high and weight around 160 kg (350 lb). Pygmy hippos, which are less aquatic than the common hippo, are found only in cool forest of western Africa, almost always travel in pairs or groups of three, and rarely form a herd.

EM/RCS

Zoo worker Maman Effendi, feeds a two-month-old pygmy hippopotamus (choeropsis liberensis) in Jakarta's Ragunan zoo February 11. The baby hippopotamus was separated from its mother after she killed two of her three offsprings.

Zoo worker Maman Effendi, feeds a two-month-old pygmy hippopotamus (choeropsis liberensis) in Jakarta's Ragunan zoo February 11. The baby hippopotamus was separated from its mother after she killed two of her three offsprings.

EN/TAN