Laurent Geslin / Red fox (Vulpes vulpes) cubs sleeping curled up together, Switzerland
John Cancalosi / Juvenile Timber rattlesnakes (Crotalus horridus) massed together at nest site, Pennsylvania, USA.
Ernie Janes / Ring-tailed lemur (Lemur catta) two huddled together for warmth. Captive.
Stefan Christmann / Emperor penguin (Aptenodytes forsteri) colony huddled together under the Southern Lights, Aurora australis, Atka Bay, Antarctica. September.
Alex Mustard / School of White collar butterflyfish (Chaetodon collare) pack together above a coral reef. North Male Atoll, Maldives. Indian Ocean
Tony Wu / Sperm whale (Physeter macrocephalus), ten swimming together in gathering of more than 50 individuals. Whales with flatulence and defecating. Sri Lanka.
Jack Dykinga / Bighorm sheep (Ovis canadensis) males grouped together before the rutting season. Valley of Fire State Park, Nevada, USA, February.
Jordi Chias / Gentoo penguins (Pygoscelis papua) swimming together in search of krill, Antarctic Peninsula, Antarctica.
Jordi Chias / Gentoo penguins (Pygoscelis papua) porpoising, swimming together in search of krill, Antarctic Peninsula, Antarctica.
SCOTLAND: The Big Picture / Orca whales (Orcinus orca) pod surfacing together, Shetland, Scotland, UK. April.
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 / Western Grebe (Aechmorphus occidentalis), pair during 'rushing' courtship display in which they run across water's surface in synchrony, near Escondido, California, USA, January.
David Pattyn / Humpback whale (Megaptera novaeangliae) two breaching at the same time together, Puerto Lopez , Santa Elena Peninsula, Manabi Province, Ecuador, July, Puerto Lopez , Santa Elena Peninsula, Manabi Prov...
Lorraine Bennery / Red-bellied lemur (Eulemur rubriventer) huddling together in tree branches. Anjozorobe Special Reserve, Madagascar. Vulnerable species, endemic.
Stefan Christmann / Emperor penguin (Aptenodytes forsteri) breeding colony, mainly males brooding eggs, huddled together on sea ice. Atka Bay, Antarctica. June.
Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two chicks aged six to eight weeks huddling together. Atka Bay, Antarctica. September.
Emanuele Biggi / Peruvian Tarantula (Pamphobeteus sp.) and Humming Frog (Chiasmocleis royi) together, Los Amigos Biological Station, Madre de Dios, Amazonia, Peru. These species have a commensal relationship. The tara...
Karine Aigner / Wild Bobcat (Lynx rufus) family of three cubs drinking water from bowl, with mother stretching . The mother chose to make her den underneath the house. Texas, USA, August. Taken with remote camera. Hi...
Jack Dykinga / Burrowing owl (Athene cunicularia), two huddled together. Marana, Pima County, Arizona, USA.
Cyril Ruoso / Long-tailed macaques (Macaca fascicularis) two juveniles sitting close together. Koram island, Khao Sam Roi Yot National Park, Thailand.
Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mating displays or defenc...
Alex Mustard / RF - Bannerfish (Heniochus diphreutes) schooling in coral reef. Long exposure. North Male Atoll, Maldives. Indian Ocean. (This image may be licensed either as rights managed or royalty free.)
Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) juvenile female 'Fadhila' aged 5 years and her brother 'Fifty' aged 3 years playing together.Gombe National Park, Tanzania.
Claudio Contreras / Silky shark (Carcharhinus falciformis) two swimming together, Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba, January. Vulnerable species.
Theo Bosboom / Banded demoiselles (Calopteryx splendens) pair still clasped together after mating, with two males resting nearby, the Netherlands, July.
Jussi Murtosaari / Blackcap (Sylvia atricapilla) female and two males huddling together for warmth while sleeping, Finland, May.
Fred Olivier / Close-up of a group of Emperor penguin (Aptenodytes forsteri) chicks huddled together in a blizzard, covered in snow, Adelie Land, Antarctica, January.
Fred Olivier / Emperor penguin (Aptenodytes forsteri) chicks huddled together during a blizzard, Adelie Land, Antarctica, January.
Tony Wu / Humpback whale (Megaptera novaeangliae) female breaching together with her male calf. The calf had a large wound on his left peduncle area, one that appeared to be the result of a large bite, Vava'u,...
Tony Wu / Humpback whales (Megaptera novangliaea) unusual scene with two adults tail-slapping together in rough seas, Vava'u, Tonga, South Pacific
Cyril Ruoso / Golden monkey (Rhinopithecus roxellana) females sitting close together with baby inbetween, Qinling Mountains, China.
Carol Walker / Wild pinto Mustang mare and foal running in Sand Wash Basin, Colorado, USA.
Wim van den Heever / Lions (Panthera leo) five drinking together, Ndutu, Tanzania
Tony Wu / Four Sperm whales (Physeter macrocephalus) rubbing their heads together while socializing, forming an X shape pattern. Caribbean.
Tony Wu / Four Sperm whales (Physeter macrocephalus) rubbing their heads together while socializing, hanging down. Caribbean.
Tony Wu / Sperm whales (Physeter macrocephalus) large group gathering together, rubbing together to shed skin, interacting and defecating. Indian Ocean, March.
Tony Wu / Group of Sperm whales (Physter macrocephalus) family group swimming together, Indian Ocean, March.
Alex Mustard / RF- Western clownfish (Amphiprion oceallaris) in Magnificent sea anemone (Heteractis magnifica). Raja Ampat, West Papua, Indonesia. (This image may be licensed either as rights managed or royalty free...
Pal Hermansen / Domestic reindeer herd (Rangifer tarandus) group close together in enclosure, Oppland, Norway, September 2014.
Wim van den Heever / Blue wildebeest (Connochaetes taurinus) herd silhouetted against the rising sun with clouds in the background. Greater Kruger National Park, South Africa
Wim van den Heever / Plains zebra (Equus quagga) group of four including foal at sunset, Savuti Marsh, Botswana.
Markus Varesvuo / Black grouse (Tetrao / Lyrurus tetrix) flock flying in snow, Suomussalmi, Finland, January.