Ole Jorgen Liodden / Polar Bear (Ursus maritimus) with blooded face looking at Glaucous Gull (Larus hyperboreus) in flight. Spitsbergen, Svalbard, July.

Pete Oxford / Hyacinth Macaw (Anodorhynchus hyacinthinus) cracking open a Piassava Palm (Attalea funifera) nut to drink the milk, Brazil

Flip Nicklin / Bearded Seal (Erignathus barbatus) with head stained red from iron-rich soil sediments in which it forages for food, Svalbard, Norway

Jabruson / Silverback Western lowland gorilla eats soil for mineral content {Gorilla gorilla gorilla} Odzala NP, Democratic Republic of Congo.

Anup Shah / Mountain gorilla eating roots {Gorilla beringei} Parc National des Volcans NP Rwanda 1997

Alex Mustard / A Whale shark (Rhincodon typus) mouth open feeding on fish eggs by sucking in water, a behaviour known as botella because the shark hangs vertical in the water like a bottle gulping in food, Isla Muje...

Luiz Claudio Marigo / Silvery-brown / Bare-face / White-footed Tamarin (Saguinus bicolor / leucopus) in canopy with food in its hand. The basin of rivers Cauca and Magdalena, Colombia. Threatened species.

Barrie Britton / Dead Polar Bear (Ursus maritimus) on sledge. Shot by Inuit of Belcher Island for their annual polar bear quota. Picture taken during filming for BBC "Planet Earth" TV Series February 2006.

Toby Roxburgh / Large European conger eel (Conger conger) at Brixham fish auction, Devon, England, UK, 2009.

Toby Roxburgh / Gilt head sea bream (Sparus aurata), on ice for sale in a fishmongers, fished in UK waters and landed at East Looe. Cornwall, England, UK, 2009.

Stephen Dalton / Blowfly {Lucilia caesar} feeding on a piece of salami, UK

Sebastian Kennerknecht / Western Gull (Larus occidentalis) chick begging for food, Elkhorn Slough, Monterey Bay, California

Thomas Marent / Orangutan (Pongo pygmaeus) female sharing food with baby, Camp Leaky, Tanjung Puting National Park, Indonesia

Heidi & Hans-Juergen Koch / Honey Bee (Apis mellifera) pair right before exchanging food mouth to mouth, Bee Station at the Bavarian Julius-Maximilians-University of Wurzburg, Germany

Heidi & Hans-Juergen Koch / Honey Bee (Apis mellifera) pair exchanging food mouth to mouth, Bee Station at the Bavarian Julius-Maximilians-University of Wurzburg, Germany

Heidi & Hans-Juergen Koch / Honey Bee (Apis mellifera) pair exchanging food mouth to mouth, Bee Station at the Bavarian Julius-Maximilians-University of Wurzburg, Germany

Jane Burton / Black Syrian Hamster {Mesocricetus auratus} male with pouches full of sunflower seeds

Jane Burton / European Hedgehog {Erinaceus europaeus} juvenile sniffing an earthworm, captive, UK

Petra Wegner / Domestic dog, Beagle balancing food on her nose

Petra Wegner / Domestic dog, Beagle balancing food on her nose

Petra Wegner / Domestic dog, Beagle balancing food on her nose

Staffan Widstrand / Child with red stained hands and tongue after eating blueberries, Sweden.

Staffan Widstrand / Inupiat Dennis Cleveland Amber, young boy next to fish harvest, Kobuk Valley NP, Alaska

Heidi & Hans-Juergen Koch / Blue Bottle Fly (Calliphora erythrocephala) feeding on Kiwi fruit showing compound eyes and mouth parts, worldwide distribution

Mike Parry / Great White Shark (Carcharodon carcharias) excited by the scent of food in the water, Dyer Island, Cape Province, South Africa

Yva Momatiuk & John Eastcott / Atlantic Puffin (Fratercula arctica) portrait of adult holding Sand Lance (Ammodytes sp) in beak to feed chick in burrow, summer breeding season, Newfoundland, Canada

Mark Moffett / Tree Frog (Phasmahyla guttata) tadpole skims the surface of mountain streams with its mouth for food, Atlantic Forest, Brazil

Mark Moffett / Tree Frog (Phasmahyla guttata) tadpole skims the surface of mountain streams with its mouth for food, Atlantic Forest, Brazil

Mark Moffett / Tree Frog (Phasmahyla guttata) tadpole skims the surface of mountain streams with its mouth for food, Atlantic Forest, Brazil

Pete Oxford / Brown Capuchin (Cebus apella) licking fingers after drinking from Piassava Palm (Attalea funifera) nut, Cerrado habitat, Piaui State, Brazil

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) infant with milk on its mouth after being fed with a bottle at the China Conservation and Research Center for the Giant Panda, Wolong Nature Reserve, China

Tom Vezo / Mountain Bluebird (Sialia currucoides) male perching on barbwire fence with prey in beak, Montana

Norbert Wu / Map Puffer (Arothron mappa) close-up of eye, eaten as fugu in Japan, flesh is extremely poisonous, Indonesia

Heidi & Hans-Juergen Koch / American Alligator (Alligator mississippiensis) with a freshly killed Egret in its mouth, unlike mammal predators they don't depend on food as a permanent energy supply, in summer and spring they eat...

Michael Quinton / Common Raven (Corvus corax) using its beak to open a snowmobile's storage compartment in search of food, Yellowstone National Park, Wyoming

Flip Nicklin / Antarctic Krill (Euphausia superba) a small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, shown feeding on diatoms which it filters through modified appendages, A...

Flip Nicklin / Antarctic Krill (Euphausia superba) a small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, shown feeding on diatoms which it filters through modified appendages, A...

Flip Nicklin / Antarctic Krill (Euphausia superba) a small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, shown feeding on diatoms which it filters through modified appendages, A...

Flip Nicklin / Antarctic Krill (Euphausia superba) a small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, shown feeding on diatoms which it filters through modified appendages, A...

Norbert Wu / Stareye Hermit (Dardanus venosus) eyes on stalks, hair on arms used for sensing food in sand, Caribbean

Norbert Wu / Sea Anemone (Urticinopsis antarctica) feeding by licking food particles off a tentacle, mouth is in center of tentacles, Antarctica

Anup Shah / Crab eating / Long tailed macaque (Macaca fascicularis) feeding on crab, Sumatran Coast Indonesia

Niall Benvie / Atlantic salmon (Salmo salar) recently caught. Scotland Montrose, Angus.

Anup Shah / Juvenile Chimpanzee {Pan troglodytes} with leaves & berries, Sweetwater Sanctuary, Kenya

Suzi Eszterhas / Mountain Gorilla (Gorilla gorilla beringei) adult feeding on wild celery, endangered, Parc National Des Volcans, Rwanda

Martin H Smith / Wild cat with rabbit prey {Felis silvestris grampia}

Pete Oxford / Brown Capuchin (Cebus apella) licking fingers after drinking from Piassava Palm (Attalea funifera) nut, Cerrado habitat, Piaui State, Brazil

Mark Moffett / Mouse Opossum (Marmosa sp) a nocturnal species, emerging in the evening to forage for food, Atlantic Forest, Brazil

Pete Oxford / Hyacinth Macaw (Anodorhynchus hyacinthinus) in Cerrado habitat drinking the milk from a Piassava Palm (Attalea funifera) nut after cracking it open, Brazil

Pete Oxford / Hyacinth Macaw (Anodorhynchus hyacinthinus) in Cerrado habitat cracking open a Piassava Palm (Attalea funifera) nut to drink the milk, Brazil

Flip Nicklin / Antarctic Krill (Euphausia superba) a small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, Antarctica

Dr Vadim Sidorovich / European mink {Mustela lutreola} in store with Common frog prey, Belarus {Rana