Anup Shah / Western lowland gorilla (Gorilla gorilla gorilla) sub-adult female 'Mosoko' aged 8 years crossing a river, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central African Republic

Eric Baccega / Climbers crossing the Plan de lAiguille Aiguille du Midi Alps France

Doug Allan / Crossing a crevasse ladder in the Khumbu Icefall on Mount Everest Nepal. Model released. Freeze Frame book plate page 143.

Klein & Hubert / African elephant (Loxodonta africana) herd crossing the Luangwa river, Luangwa National Park, Zambia

Doug Gimesy / Koala (Phascolarctos cinereus) mother and joey are released by Emily Cordy (left/green clothes) - a Forest and Wildlife officer (and assisted by members from the Australian Defence Force) at Log Cros...

Milan Radisics / Service road crossing an abandoned pond used for the disposal and stacking of phosphogypsum with crystallised patterns and shallow, but highly toxic radioactive green water in Huelva, Southern Spain....

Milan Radisics / Service road crossing an abandoned pond used for the disposal and stacking of phosphogypsum with crystallised patterns and shallow, but highly toxic radioactive green water in Huelva, Southern Spain....

Marie Read / Black-necked stilts (Himantopus mexicanus) pair performing post-copulatory display (as copulation ends, the male slides off the female leaving his wings draped over her and crossing his bill with hers...

Marie Read / Sandhill cranes (Grus canadensis) (Florida race), adult with two small chicks crossing highway, Kissimmee, Florida, USA, March.

Paul Hobson / Badger (Meles meles) crossing road in residential area at night. Sheffield, England, UK. October 2018.

Karine Aigner / Bengal tiger (Panthera tigris tigris) running across dirt track between a large number of watching tourists. Ranthambore National Park, Rajasthan, India. 2018.

Cyril Ruoso / Golden monkey (Rhinopithecus roxellana) jumping over a frozen stream, Qinling Mountains, China. Sequence 2 of 7

Yashpal Rathore / Asiatic elephant (Elephas maximus), herd drinking water and crossing Mountain River at dawn, Jim Corbett National Park, India.

Yashpal Rathore / Asiatic elephant (Elephas maximus), herd with few days old calf crossing forest path. Jim Corbett National Park, India.

David Pattyn / Zanzibar red colobus monkey (Procolobus kirkii) crossing the main road through the Reserve, Jozani forest, Jozani Chwaka Bay NP, Zanzibar, Tanzania, August.

Wim van den Heever / Lioness (Panthera leo) crossing water channel. Okavango Delta, Botswana.

Anup Shah / Eastern White-bearded Wildebeest (Connochaetes taurinus) herd crossing the Mara River. Masai Mara National Reserve, Kenya.

Anup Shah / Eastern White-bearded Wildebeest (Connochaetes taurinus) herd crossing the Mara River. Masai Mara National Reserve, Kenya.

Jeff Vanuga / Traffic jam caused by Grizzly bear (Ursus arctos horribilis) mother and cubs crossing road, watched by tourists and photographers, Yellowstone National Park, Wyoming, USA, October 2015.

Wim van den Heever / Lion (Panthera leo) crossing water, Okavango Delta, Botswana.

Bruno D'Amicis / Tenebrionid beetle (Tenebrionidae) crossing Fennec fox (Vulpes zerda) tracks on sand. Grand Erg Oriental, Kebili Governorate. Tunisia.

Andy Rouse / Bengal tiger (Panthera tigris tigris) with tourists watching from cars, Ranthambore, India

Klein & Hubert / One Masai giraffe (Giraffa camelopardalis tippelskirchi) portrait with another in distance, while crossing a dry lake bed, Kenya

Kirkendall-Spring / Hiker crossing Newton Creek, Elk Meadows Trail, Mount Hood Wilderness. Oregon, USA, July 2014. Model released.

Steven Kazlowski / Polar bear (Ursus maritimus) juvenile crossing over newly forming pack ice, during autumn freeze up, Beaufort Sea, off Arctic coast, Alaska

Ann & Steve Toon / Cape buffalo (Syncerus caffer) crossing the Chobe River, followed by swarm of flies, Chobe Game Reserve, Botswana, Africa.

Marie Read / Royal terns (Sterna maxima) pair crossing bills during courtship behaviour, Fort DeSoto Park, Florida, USA

Anup Shah / Eastern White-bearded Wildebeest (Connochaetes taurinus) herd crossing the Mara River. Maasai Mara National Reserve, Kenya.

Anup Shah / Eastern White-bearded Wildebeest (Connochaetes taurinus) herd crossing the Mara River. Maasai Mara National Reserve, Kenya.

Anup Shah / Common or plains zebra (Equus quagga burchelli) and Eastern White-bearded Wildebeest (Connochaetes taurinus) mixed herd crossing the Mara River. Maasai Mara National Reserve, Kenya.

Anup Shah / Eastern White-bearded Wildebeest (Connochaetes taurinus) herd crossing the Mara River. Maasai Mara National Reserve, Kenya.

Anup Shah / Common or plains zebra (Equus quagga burchelli) and Eastern White-bearded Wildebeest (Connochaetes taurinus) mixed herd crossing the Mara River. Maasai Mara National Reserve, Kenya.

Nick Garbutt / Adult Giant Anteater (Myrmecophaga tridactyla) crossing the Transpantaneira Highway. Northern Pantanal, Moto Grosso State, Brazil, South America.

David Noton / People crossing a footbridge over the Nam Khan River, Luang Prabang, Laos, March 2009.

Denis-Huot / Rear view of Wildebeest (Connochaetes taurinus) herd crossing the Mara river, Masai-Mara game reserve, Kenya.

Eric Baccega / Portrait of Naro San Bushman with leather headdress made of duiker skin, Kalahari, Ghanzi region, Botswana, Africa. October 2014.

Sam Hobson / Urban Red fox (Vulpes vulpes), adult male (dog). Bristol, UK. August.

Sam Hobson / Fallow deer (Dama dama) buck crossing road under street lights. London, UK. January.

Olga Kamenskaya / Mini van crossing over pile of ice on Lake Baikal, Siberia, Russia, March.

Olga Kamenskaya / Mini van crossing Lake Baikal ice, Siberia, Russia, March.

Angelo Gandolfi / Giant Anteater (Myrmecophaga tridactyla) approaching livestock fence, Pantanal. Brazil

Anup Shah / Common or Plains zebra herd crossing the Mara River - wide angle perspective (Equus quagga burchellii). Masai Mara National Reserve, Kenya. Taken with remote wide angle camera.

Anup Shah / Eastern white-bearded wildebeest (Connochaetes taurinus) herd crossing the Mara River watched by tourists. Masai Mara National Reserve, Kenya. Taken with remote wide angle camera.