Ross Hoddinott / Red fox (Vulpes vulpes) vixen yawning in the morning light (captive). Lifton, Devon, UK, May
Jabruson / Hippopotamuses fighting (Hippopotamus amphibius) taken before major crash in numbers in the 1990s due to political instability and hunting. Rwindi sector of the Virunga National Park. North Eastern Za...
Denis-Huot,Denis-Huot / Leopard (Panthera pardus) yawning, Masai-Mara Game Reserve, Kenya
Nick Garbutt / Adult male Hippopotamus (Hippopotamus amphibius) posturing in agressive 'yawn' behaviour, Luangwa River, South Luangwa National Park, Zambia, November
Nick Garbutt / Adult male Hippopotamuses (Hippopotamus amphibius) posturing in agressive 'yawn' behaviour, Luangwa River, South Luangwa National Park, Zambia, November. Digital composite (two frames stitched togethe...
Fiona Rogers / Bornean Orang-utan (Pongo pygmaeus wurmbii) mature male 'Tom' yawning head portrait. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia, June 2010. Rehabilitated and rele...
Bruno D'Amicis / Hippopotamus (Hippopotamus amphibius) giving yawn threat, Gojeb river, Kaffa Zone, Southern Ethiopia, East Africa December 2008
Ingo Arndt / Alpine Marmot (Marmota marmota) yawning, Austria
Yva Momatiuk & John Eastcott / Mustang (Equus caballus) stallion yawning in evening sunlight, Wyoming
Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) climbing tree, Rocky Mountains, North America
Pete Oxford / Alpaca (Lama pacos) baby, Andes Mountains, South America
Gerry Ellis / Bengal Tiger (Panthera tigris tigris) yawning, Hilo Zoo, Hawaii
Konrad Wothe / African Lion (Panthera leo) family of adult females and cubs on fallen tree, Serengeti, Tanzania
Tim Fitzharris / Siberian Tiger (Panthera tigris altaica) yawning, endangered, native to Siberia
Tim Fitzharris / Hippopotamus (Hippopotamus amphibius) with mouth agape, Kenya
Michael Quinton / Bobcat (Lynx rufus) kitten yawning while resting on a log in summer, Idaho
Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) yawning, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador
Shin Yoshino / African Lion (Panthera leo) male yawning, Masai Mara National Reserve, Kenya
Mitsuaki Iwago / African Lion (Panthera leo) mother and yawning cub, Serengeti National Park, Tanzania
Mitsuaki Iwago / African Lion (Panthera leo) female roaring, Serengeti National Park, Tanzania
Jim Brandenburg / Cottontail Rabbit (Sylvilagus aquaticus) yawning, South Dakota
Michio Hoshino / Polar Bear (Ursus maritimus) mother and two cubs, Churchill, Manitoba, Canada
Larry Minden / Desert Tortoise (Gopherus agassizii) in a field of yellow flowers, Mojave Desert, California
Jim Brandenburg / Arctic Fox (Alopex lagopus) yawning, North America
Sylvain Cordier / RF - Cougar (Puma concolor), juvenile aged one year, yawning, Torres del Paine, Patagonia. (This image may be licensed either as rights managed or royalty free.)
Ashley Cooper / Antarctic fur seal pup (Arctocephalus gazella) at Salisbury Plain, South Georgia, Southern Ocean. February.
Ashley Cooper / Southern elephant seal (Mirounga leonina) with an old whaling ship behind. Grytviken, South Georgia, Antarctica, February.
Alex Mustard / Orange hairy / Straited frogfish (Antennarius striatus) yawns while illuminated by a snooted strobe, creating a spotlight. Frogfish yawn as an aggressive behaviour. Dauin, Negros Island, Philippines....