Indian Gharial, Chitwan National Park, Nepal

Lion (panthera leo). Masaii mara, kenya, young male yawning in evening light.

Asiatic lion (panthera leo persicus) native to india (captive bristol zoo)

Reef fish, close up of face.

Whale Shark with diver. (rr)

Needle cuttlefish, Sepia aculeata, front view at night, Dumaguete, Negros Island, Philippines.

Beaked Whale stranded on coral reef during low tide, Mesoplodon sp., Mili, Marshall Islands (N. Pacific)..

Broadband cuttlefish, Sepia latimanus, in sandy bottom, Gato Island, Cebu, Philippines.

Manta ray, Manta birostris, feeding at night, Kailua-Kona, Big Island, Hawaii

The eyes of a Mountain Gorilla (Gorilla beringei beringei) of the Muhoza group, peak out from behind foliage, in Volcanoes National Park, Virunga mountain range, Rwanda

Snarling leopard, big cat, Mammal, Africa

Stream mouth and hills near the Pacific, Big Sur Coast, California, USA, America

Chimpanzee (Pan troglodytes troglodytes), male, yawning, captive, Florida, USA

Cougar or Puma (Puma concolor, Felis concolor), adult, with mouth open, snow, Montana, USA

Closeup of large whale jumping head-on out of blue water

Bornean Orangutan (Pongo pygmaeus), thoughtful-looking female, portrait

Bornean Orangutan (Pongo pygmaeus), male with prominent cheek flaps, portrait

Bornean Orangutan (Pongo pygmaeus), thoughtful-looking female, portrait

Bornean Orangutan (Pongo pygmaeus), thoughtful-looking female, portrait

Whale shark (Rhincodon typus) swallows plankton, has a ship's keeper (Echeneis naucrates) in its mouth, Philippine Sea, Philippines, Asia

Lion (Panthera leo), with a mane, Ngorongoro, Serengeti, Tanzania, Africa

Southern elephant seal (Mirounga leonina), male, after breeding period on the Falkland Islands. South America, Falkland Islands, January

Southern elephant seal (Mirounga leonina) after harem and breeding season. Young bulls fighting and establishing pecking order. South America, Falkland Islands, January

Southern elephant seal (Mirounga leonina), old bull, after harem and breeding season on the Falkland Islands. South America, Falkland Islands, January

Hawaiian Green sea turtle (Chelonia mydas) swimming close to the surface with sunburst; Maui, Hawaii, United States of America

Hawaiian Green sea turtle (Chelonia mydas) swimming over the coral on the sea floor; Maui, Hawaii, United States of America

A tentaculate ctenophore, also known as comb jelly or sea gooseberry (Pleurobrachia sp.), opens its mouth to ingest zooplankton prey during a blackwater dive off the Kona coast, the Big island; Island of Hawaii, Hawaii, United States of America

While a Hawaii Cleaner Wrasse (Labroides phthirophagus) searches for parasites in its mouth, a Reef Manta Ray (Mobula (formerly Manta) alfredi) hovers over a reef cleaning station off the Kona Coast, the Big Island, Hawaii, USA during the summer. This par

A Whale Shark (Rhiniodon typus) with it's mouth open, filter feeding at the surface. This is the world's largest species of fish, Oslob, Philippines

Hawaii, Big Island, Kona, Whale Shark (Rhiniodon typus) with mouth wide open