Denis-Huot / Lioness (Panthera leo) playing with a lost baby Wildebeest (Connochaetes taurinus), Masai-Mara Game Reserve, Kenya

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) behind Polar bear (Ursus maritimus) framed by its legs, Svalbard, Norway, July.

Ole Jorgen Liodden / Meadow pipit (Anthus pratensis) feeding young Eurasian cuckoo (Cuculus canorus), Valdres, Norway, July.

Gabriel Rojo / Marsh deer (Blastocerus dichotomus) male with Cattle tyrant (Machetornis rixosus) on back, Ibera Marshes, Corrientes Province, Argentina.

Gabriel Rojo / White-banded tree-frog (Hypsiboas pulchellus) with Ladybird (Coccinellidae) Calden forest, La Pampa, Argentina

Jane Burton / Blue and white Burmese-cross kitten rubbing against sooty-fawn dwarf Rex rabbit.

Nick Garbutt / Yacare Caiman (Caiman yacare) gaping to regulate its body temperature, with attendant hoverflies, the Paraguay River, Taiama Reserve, western Pantanal, Brazil, South America.

Ben Cranke / Wattled Jacana (Jacana jacana) perched on resting Capybara (Hydrochoerus hydrochaeris) Mato Grosso, Pantanal, Brazil. July.

Jane Burton / Baby Grey Squirrel (Sciurus carolinensis) 'kissing' a tabby kitten.

Jane Burton / Blue Dutch rabbit with kitten with matching colouration.

Nick Upton / Young Edible crab (Cancer pagurus) and a Rock goby (Gobius paganellus) side by side in a rock pool, looking towards the camera, The Gower, Wales, UK, August.

Emanuele Biggi / Peruvian Tarantula (Pamphobeteus sp.) adult, walking over Humming Frog (Chiasmocleis royi) without preying on it. Los Amigos Biological Station, Madre de Dios, Amazonia, Peru. These species have a com...