Animal Tracks: March 13th - 20th

A male Amur leopard reacts after being introduced to a female at Marwell Zoo near Winchester in Britain, March 18, 2016. With less than forty of the critically endangered species remaining in the wild globally, the two were introduced today as the female has come onto season, with the hope that they will successfully breed in captivity, two years after their first cub was born. REUTERS/Toby Melville

A chimpanzee drinks a sweet refreshment at Dusit Zoo in Bangkok, Thailand March 17, 2016. REUTERS/Chaiwat Subprasom

A Hanuman Langur monkey looks through a glass enclosure, part of the new Land of the Lions display, at London Zoo, Thursday, March 17, 2016. The Queen and Prince Philip visited to unveil Land of the Lions, an Asiatic lion enclosure at ZSL London Zoo. (AP Photo/Kirsty Wigglesworth)

Hanuman langur monkeys are pictured in their new enclosure at London zoo on March 17, 2016. / AFP PHOTO / LEON NEALLEON NEAL/AFP/Getty Images

A Steller sea lion eats fish during a press visit at the Marineland Zoo in Antibes before its reopening, six months after the flooding that affected the French Riviera in October 2015, in Antibes, France, March 17, 2016. REUTERS/Eric Gaillard TPX IMAGES OF THE DAY

A three-month-old Polar Bear cub is seen at the zoo in Brno, South Moravia, Czech Republic on March 17, 2016. / AFP PHOTO / Radek MicaRADEK MICA/AFP/Getty Images

A meerkat sits under a heat lamp in it's outside enclosure at Marwell Zoo near Winchester in Britain, March 18, 2016. REUTERS/Toby Melville

Giraffes look out from their enclosure at Marwell Zoo near Winchester in Britain, March 18, 2016. REUTERS/Toby Melville