Joel Sartore / Photo Ark / A black phase critically endangered Indochinese leopard (Panthera pardus delacouri) snarling, Zoo Taiping, Malaysia. Captive.

Phil Savoie / White tent making bat (Ectophylla alba) roosting in Heleconia leaf, La Selva Field Station, Costa Rica.

Giri Cavale / Melanistic leopard / Black panther (Panthera pardus) on territorial patrol on track, Nagarahole National Park, Nilgiri Biosphere Reserve, Karnataka, India.

Uri Golman / Forest reindeer, (Rangifer tarandus fennicus) in velvet, Viiksimo, Kuhmo region. Finland, July. Rare subspecies which were nearly extinct in the 19th Century.

Kristel Richard / Headshot of two rare black Kladruber stallions, harnessed for driving, at the Great Riding festival, in Slatinany national stud, Pardubice Region, Czech Republic. June 2015.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) mother with rare white furred baby, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) rare white furred baby jumping, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) rare white furred baby calling, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) rare white furred baby playing with another baby. Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) mother with rare white furred male baby, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) rare white furred baby playing with flower, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) mother with rare white furred baby, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) mother carrying rare white furred baby on belly, Jigokudani Valley, Nagano Prefecture, Japan. June.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) mother with rare white furred baby, Jigokudani Valley, Nagano Prefecture, Japan. June.

Klein & Hubert / Herd of African elephants (Loxodonta africana) walking, Kenya

Aflo / Red-Crowned Crane (Grus japonensis) flock roosting in icy river in winter, Tsurui, Hokkaido, Japan. February.

Andy Rouse / Bengal tiger (Panthera tigris tigris) female 'T19 Krishna' with 11 month cub, Ranthambore National Park, India.

Andy Rouse / Bengal tiger (Panthera tigris tigris) 11 month old cubs play fighting, Ranthambhore National Park, India.

Tui De Roy / Santa Cruz Galapagos tortoise (Chelonoidis nigra porteri) feeding on grass, Santa Cruz Highlands, Galapagos

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) group on beach, Galapagos

Denis-Huot / Crowned crane (Balearica regulorum gibbericeps) pair at sunrise, Masai-Mara Game Reserve, Kenya. June.

Jordi Chias / Juvenile Green Turtle (Chelonia mydas) Armenime cove, South Tenerife, Canary Island, Atlantic Ocean

Jordi Chias / Juvenile Green Turtle (Chelonia mydas) Armenime cove, South Tenerife, Canary Island, Atlantic Ocean

Jordi Chias / Green Turtle (Chelonia mydas) from underneath with diver in the background, Sulawesi, Indonesia, Indian Ocean.

Jordi Chias / Juvenile Green turtle (Chelonia mydas) swimming near the surface, split level view, Fakarava atoll lagoon, Tuamotu Archipelago, French Polynesia, Pacific Ocean.

Jordi Chias / Green turtle (Chelonia mydas) feeding in Cymodocea, inside lagoon, Mayote Islands, Indian Ocean

Jordi Chias / Hawksbill turtle (Eretmochelys imbricata) swimming over de reef, Mayotte Island, Comores, Indian Ocean.

Jordi Chias / Green turtle (Chelonia mydas) covering with sand the eggs after laying them in the beach, Europa Island, Eparse Islands / Scattered Islands in the Indian Ocean, Mozambique Channel, Indian Ocean.

Jordi Chias / Green turtle (Chelonia mydas) returning at sea after egg laying in the beach, Europa Island, Eparse Islands / Scattered Islands in the Indian Ocean, Mozambique Channel, Indian Ocean.

Jordi Chias / Male Green turtles (Chelonia mydas) inside lagoon, Europa Island, Eparse Islands / Scattered Islands in the Indian Ocean, Mozambique Channel, Indian Ocean.

Jordi Chias / Loggerhead turtle (Caretta caretta) swimming near the surface, Balearic channel, Spain.

Jordi Chias / Loggerhead turtle (caretta caretta) swimming near the surface with Pilot fish. Balearic channel, Spain.

Jordi Chias / Loggerhead turtle (Caretta caretta) swimming near the surface, Balearic channel, Spain.

Jordi Chias / Loggerhead turtle (Caretta caretta) Santa Maria Island; Azores archipelago, Atlantic ocean

Jordi Chias / Loggerhead turtle (Caretta caretta) Los Gigantes, South Tenerife, Canary Islands, Atlantic Ocean.

Jordi Chias / Underwater cameraman filming Loggerhead turtle (Caretta caretta) Los Gigantes, South Tenerife, Canary Islands, Atlantic Ocean.

Jordi Chias / Loggerhead turtle (Caretta caretta) Los Gigantes, South Tenerife, Canary Islands, Atlantic

Jordi Chias / Loggerhead turtle (Caretta caretta) with diver, Los Gigantes, South Tenerife, Canary Islands, Atlantic

Jordi Chias / Loggerhead turtle (Caretta caretta) Los Gigantes, South Tenerife, Canary Islands, Atlantic

Jordi Chias / Loggerhead turtle (Caretta caretta) surrounded by other small fish, Los Gigantes, South Tenerife, Canary Islands, Atlantic

Jordi Chias / Loggerhead turtle (Caretta caretta) with small fish, Los Gigantes, South Tenerife, Canary Islands, Atlantic

Jordi Chias / Loggerhead turtle (Caretta caretta) trapped in an abandoned drifting net, Balearic Channel, Mediterranean sea.

Anup Shah / White-backed vultures (Gyps africanus) waiting for Spotted hyenas (Crocuta crocuta) to finish feeding on a kill. Maasai Mara National Reserve, Kenya.

Anup Shah / African elephant (Loxodonta africana) watching over the body of a dead elephant. Maasai Mara National Reserve, Kenya.

Anup Shah / African elephant (Loxodonta africana) herd watching over the body of a dead elephant. Maasai Mara National Reserve, Kenya.

Anup Shah / African elephant (Loxodonta africana) herd. Maasai Mara National Reserve, Kenya.

Roland Seitre / Green peafowl (Pavo muticus) portrait. Captive, occurs in Asia. Endangered species.

Roland Seitre / Buergers' tree-kangaroo (Dendrolagus goodfellowi buergersi) climbing. Currumbin Sanctuary, Queensland, Australia. Captive, endemic to Papua New Guinea. Endangered species.