A zoo keeper feeds Diego, a three month old howler monkey, which is reared at Edinburgh Zoo, July 29, 2008 in Scotland. (Photo by Jeff J. Mitchell/Getty Images)

An Amur tiger walks across a passageway after a news conference at the Philadelphia Zoo, Wednesday, May 7, 2014, in Philadelphia. The see-through mesh pathway called Big Cat Crossing is part of a national trend called animal rotation that zoos use to enrich the experience of both creatures and guests. (Photo by Matt Slocum/AP Photo)

Khan, a five-year-old male White Bengal tiger, looks on inside an open-air cage at the Royev Ruchey zoo in Krasnoyarsk, Russia, October 21, 2016. (Photo by Ilya Naymushin/Reuters)

A woman rides a horse through the biannual Stow Horse Fair in the town of Stow-on-the-Wold, southern England on October 24, 2019. The Stow Horse Fair has attracted Gypsy and Traveller people from all over the country to the Cotswold town every May and October since 1476. (Photo by Oli Scarff/AFP Photo)

A motorcycle sits at the site of a destroyed home after the Soberanes Fire burned through the Palo Colorado area, north of Big Sur, California, July 31, 2016. (Photo by Michael Fiala/Reuters)

Burger King employee Rumi Sekine shows the Kuro Diamond burger, right, and the Kuro Pearl burger at its Shibuya restaurant in Tokyo Tuesday, September 16, 2014. The international hamburger chain in Japan will launch the two new “kuro burger”, or “black burger” menus that sport buns, cheese and sauce all in black color, starting on Friday, Sept. 19, for a limited period. The buns and cheese are darkened with bamboo charcoal while the beef patties made with black-pepper are topped with the garlic sauce using squid ink. (Photo by Koji Sasahara/AP Photo)

Miranda Kerr attends Carine Roitfeld & Stephen Gan celebration of the launch of CR Fashion Book N.5 in Paris, Tuesday, September 30, 2014. (Photo by Zacharie Scheurer/AP Photo)