This photo taken on October 6, 2016 at the Bois the La Cambre (Wood of La Cambre) in Brussels shows swans swimming in a pond covered by duckweed or water lens. (Photo by Emmanuel Dunand/AFP Photo)





Young carp are fed supplements with a bottle at a tropical and ornamental fish exhibition in Bangkok on October 8, 2016. (Photo by Lillian Suwanrumpha/AFP Photo)





A stag roars during the rutting season, when they breed, in an inversion fog in Richmond Park, south west London, Tuesday, October 4, 2016. (Photo by Matt Dunham/AP Photo)





Catfish gather in the corner of the Gundalao lake as they wait to be fed by passersby in Kishangarh, Rajasthan, India, October 07, 2016. (Photo by Himanshu Sharma/Reuters)





The Sydney Opera House and Harbour Bridge can be seen behind giraffes as they eat leaves shaped into the number 100 during centenary celebrations at Sydney's Taronga Zoo, Australia, October 7, 2016. (Photo by Rick Stevens/Reuters)





A newly born male Asian elephant calf stands near to its mother Tamara in their enclosure at Prague Zoo, Czech Republic, October 8, 2016. (Photo by David W. Cerny/Reuters)





A newly born male Asian elephant calf stands near to its mother Tamara in their enclosure at Prague Zoo, Czech Republic, October 8, 2016. (Photo by David W. Cerny/Reuters)





A newly born male Asian elephant calf stands near to its mother Tamara in their enclosure at Prague Zoo, Czech Republic, October 8, 2016. (Photo by David W. Cerny/Reuters)





A newborn male Asian elephant calf stands near its mother Tamara in their enclosure at Prague Zoo, Czech Republic, October 8, 2016. (Photo by David W. Cerny/Reuters)





A newborn male Asian elephant calf stands near its mother Tamara in their enclosure at Prague Zoo, Czech Republic, October 8, 2016. (Photo by David W. Cerny/Reuters)





Beads of water stream from an osprey’s wings in a photograph taken a split second after the bird swooped to snatch a fish from the Onga river in Fukuoka prefecture, Japan on October 3, 2016. (Photo by Tristan Joe Emoto/Solent News)





A Javan green magpie chick, one of the first to be bred in the UK, at Chester zoo in Chester, England on October 4, 2016. (Photo by Rex Features/Shutterstock)





Giraffes enjoy a birthday-themed breakfast during celebrations at Taronga Zoo in Sydney, New South Wales, Australia, 07 October 2016. The day marks exactly 100 years since the Zoo first opened its gates in Mosman on 07 October 1916. (Photo by Joel Carrett/EPA)





A bear is shot with a tranquilizer gun before being moved from the al-Ma’wa New Hope Center, outside Amman, Jordan, Sunday, October 2, 2016. Two tigers and a bear were moved on Sunday to a wildlife reserve in northern Jordan. They are among 25 animals to be released into the al-Mawa reserve near the town of Jerash. Many of the 17 lions, five wolves, two tigers and a bear were confiscated from smugglers. Two lion cubs came from the Gaza Strip last year, while another two were rescued after smugglers advertised the cubs on Facebook. (Photo by Thomas Hartwell/AP Photo)





A sedated bear is examined before being moved from the al-Ma’wa New Hope Center, outside Amman, Jordan, Sunday, October 2, 2016. (Photo by Thomas Hartwell/AP Photo)





A sedated bear is prepared to be moved from the al-Ma’wa New Hope Center, outside Amman, Jordan, Sunday, October 2, 2016. (Photo by Thomas Hartwell/AP Photo)





A sedated bear is prepared to be moved from the al-Ma’wa New Hope Center, outside Amman, Jordan, Sunday, October 2, 2016. (Photo by Thomas Hartwell/AP Photo)





Goats wait to get unloaded from a vehicle at a livestock market during Dashain, the biggest religious festival for Hindus in Nepal, in Kathmandu, Nepal October 4, 2016. (Photo by Navesh Chitrakar/Reuters)





A wild otter feeds on fish at Marina bay reservoir in Singapore on October 3, 2016. Smooth-coated otters are commonly spotted in reservoirs and some parks and there some 50 otters estimated in Singapore. (Photo by Roslan Rahman/AFP Photo)





A squirrel carries a walnut in its mouth in Rotenburg, Germany, 04 October 2016. (Photo by Daniel Reinhardt/EPA)





Pigs look into the camera in a stall of a pig farmer who has 800 pigs in Frankfurt, Germany, Tuesday, October 4, 2016. (Photo by Michael Probst/AP Photo)





A two-day old baby giant anteater (Myrmecophaga tridactyla) rides on the back of its mother Isabella sticking to her fur in their enclosure in the Budapest Zoo in Budapest, Hungary, 07 October 2016. Isabella and her mate William have been living in the zoo since 2014, they were sent here with the explicit aim to breed offsprings. (Photo by Attila Kovacs/EPA)





Veterinarian Radoslaw Fedaczynski with a tiny otter in the Rehabilitation Centre of the Protected Animals in Przemysl, South-East Poland, 07 October 2016. The otter was abandoned by his mother and it was threatened with death from starvation or attack by predator. The animal was found by the angler in the area of Sanok, in the South-East Poland. The otter receives medical treatment and then it will be released to freedom. (Photo by Darek Delmanowicz/EPA)