Baby clouded leopards, born early in March 2015 are presented by zoo keepers at the Olmense Zoo in Olmen, Belgium, April 16, 2015. The clouded leopard is an endangered species with only some 10,000 specimen remaining on earth, said Robby Van der Velden, a biologist at the Olmense Zoo. (Photo by Yves Herman/Reuters)

Baby clouded leopards, born early in March 2015 are presented by zoo keepers at the Olmense Zoo in Olmen, Belgium, April 16, 2015. (Photo by Yves Herman/Reuters)

Baby clouded leopards, born early in March 2015, are presented by Robby Van der Velden (L), a biologist at the Olmense Zoo in Olmen, Belgium, April 16, 2015. (Photo by Yves Herman/Reuters)

Baby clouded leopards, born early in March 2015, are presented by zoo keepers at the Olmense Zoo in Olmen, Belgium, April 16, 2015. (Photo by Yves Herman/Reuters)

Baby clouded leopards, born early in March 2015 are presented by zoo keepers at the Olmense Zoo in Olmen, Belgium, April 16, 2015. (Photo by Yves Herman/Reuters)

A baby clouded leopard, born early in March 2015, is presented by a zoo keeper at the Olmense Zoo in Olmen, Belgium, April 16, 2015. (Photo by Yves Herman/Reuters)

Baby clouded leopards, born early in March 2015, are presented by zoo keepers at the Olmense Zoo in Olmen, Belgium, April 16, 2015. (Photo by Yves Herman/Reuters)

A baby clouded leopard, born early in March 2015, is seen at the Olmense Zoo in Olmen, Belgium, April 16, 2015. (Photo by Yves Herman/Reuters)

Baby clouded leopards, born early in March 2015, are presented by zoo keepers at the Olmense Zoo in Olmen, Belgium, April 16, 2015. (Photo by Yves Herman/Reuters)

A baby oriental small-clawed otter (L) stays next to its mother at the Olmense Zoo in Olmen, Belgium, April 16, 2015. (Photo by Yves Herman/Reuters)