Zoological parks

FILE - In this Wednesday, March 27, 2013 file photo, Melati a female Sumatran Tiger walks past her frozen pool, at London Zoo. London Zoo says one of its female Sumatran tigers has been killed by a potential mate while the two animals were being introduced. The zoo says 10-year-old Melati died Friday, Feb. 8, 2019 during her first encounter with Asim, a 7-year-old male. It says staff are “devastated by the loss of Melati, and we are heartbroken by this turn of events.” (AP Photo/Kirsty Wigglesworth, file)

This image taken from video and made available by London Zoo, shows Sumatran tiger named Asim at London Zoo, Wednesday Jan. 30, 2019. Asim was recently transfered to London from a Danish safari park to serve as a new mate for female resident tiger Melati. (London Zoo via AP)

This undated photo issued by Belfast Zoo, Northern Ireland, shows a red panda on the zoo premises. Officials say a rare red panda has gone missing from Belfast Zoo in Northern Ireland on Sunday. Belfast City Council officials said Monday Jan. 28, 2019, the animal is not considered dangerous but warned the public not to approach it if it is spotted. (Belfast Zoo via AP)

Two Asian Elephants eat Christmas trees at Tierpark zoo in Berlin, Friday, Jan. 4, 2019. Vendors donate not sold Christmas trees to the zoo after Christmas to feed the trees to animals. (AP Photo/Markus Schreiber)

The empty entrance of the Smithsonian's National Zoo is seen, Wednesday, Jan. 2, 2019, in Washington. Smithsonian's National Zoo is closed due to the partial government shutdown. President Donald Trump is convening a border security briefing Wednesday for Democratic and Republican congressional leaders as a partial government shutdown over his demand for border wall funding entered its 12th day. (AP Photo/Carolyn Kaster)

In this photo taken sometime between September and November 2018 and provided by Wolf Park, intern Alexandra Black trains with Khewa the wolf at Wolf Park in Battle Ground, Ind. The fatal mauling of Black, a zoo intern by a lion that escaped from a locked pen at the Conservators Center in North Carolina, illustrates the need for state regulators to crack down on unaccredited exhibitors of dangerous animals, animal welfare advocates said Monday, Dec. 31. (Monty Sloan/Wolf Park via AP)

People skate on the National Gallery of Art Sculpture Garden Ice Rink, Thursday, Dec. 27, 2018, as a partial government shutdown continues in Washington. The museum and the skate rink will be closed to the public after January 2nd as a result of the shutdown if it continues into the new year. Behind the rink is the National Archives, which is closed due to the shutdown. President Donald Trump has vowed to hold the line on his budget demand, telling reporters during his visit to Iraq Wednesday that he'll do "whatever it takes" to get money for border security. The White House and congressional Democrats have been talking but to little effect. (AP Photo/Jacquelyn Martin)

This Wednesday, Dec. 12, 2018, photo shows a Mexican gray wolf that is introduced at the ABQ BioPark in Albuquerque, N.M. The Albuquerque zoo said Thursday, Dec. 27, 2018, it received the wolf earlier this month from the Binder Zoo in Michigan, as part of an international recovery effort that includes breeding the endangered animals in captivity to ensure their genetic viability. The animal will be a mate for a 4-year-old female wolf already at the ABQ BioPark. (Tina Deines/ABQ BioPark via AP)