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Crab-eating (long-tailed) macaque monkey with baby by a river mouth in the national park at Pangandaran, Java, Indonesia, Southeast Asia, Asia

Buccal cavity (mouth) and tentacles of Humboldt (Jumbo) squid (Dosidicus gigas), Gulf of California, Baja California, Mexico, North America

Whale shark (Rhincodon typus) feeding at the surface on zooplankton, mouth open, known as ram feeding, Yum Balam Marine Protected Area, Quintana Roo, Mexico, North America

Scientist and whale shark (Rhincodon typus) feeding at the surface on zooplankton, mouth open, known as ram feeding, Yum Balam Marine Protected Area, Quintana Roo, Mexico, North America

Dominant male proboscis monkey (Nasalis larvatus) has a pendulous nose that covers the mouth and is attractive to females, Labuk Bay Proboscis Monkey Sanctuary, Sabah, Borneo, Malaysia, Southeast Asia, Asia

The yellow moray eel (Gymnothorax melatremus) living in an artificial reef under an oil rig near Mabul Island, Celebes Sea, Sabah, Malaysia, Southeast Asia, Asia

Stonefish (Synanceia verrucosa) is extremely venomous, Celebes Sea, Sabah, Malaysia, Southeast Asia, Asia

Dominant male proboscis monkey (Nasalis larvatus) has a pendulous nose that covers the mouth and is attractive to females, Labuk Bay Proboscis Monkey Sanctuary, Sabah, Borneo, Malaysia, Southeast Asia, Asia

Giant Frogfish (Antennarius commersonii) can grow to 30 cm and is commonly encountered by divers, Celebes Sea, Sabah, Malaysia, Southeast Asia, Asia

Dominant male proboscis monkey (Nasalis larvatus) has a pendulous nose that covers the mouth and is attractive to females, Labuk Bay Proboscis Monkey Sanctuary, Sabah, Borneo, Malaysia, Southeast Asia, Asia

A bluestreak cleaner wrasse searching the mouth of a clown sweetlips for parasites, Yap, Micronesia, Pacific

A great white shark (Carcharodon carcharias), breaks the surface off Guadalupe Island, Mexico, North America

Fallow deer with impressive antlers standing by a wooden fence in a grassy field, United Kingdom, Europe

A Nile crocodile (Crocodylus niloticus) resting with open mouth at the water's edge, Kwai river, Moremi Wildlife reserve, Okavango Delta, Botswana, Africa

The reef manta ray (Manta alfredi) with yellow pilot fish in front of its mouth, Dampier Strait, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

A Galapagos shark (Carcharhinus galapagensis), breaching the surface, Hawaii, United States of America, Pacific, North America

The very capable teeth in the jaw of a stout moray (Gymnothorax eurostus), Hawaii, United States of America, Pacific, North America

Raccoon (racoon) (Procyon lotor) in a tree with an open mouth, in captivity, Minnesota Wildlife Connection, Minnesota, United States of America, North America

A close-up of the mouth of a whitemouth moray eel (Gymnothorax meleagris), showing its needle sharp teeth, United States of America, North America

Hippopotamus (Hippopotamus amphibius) yawning, Serengeti National Park, Tanzania, East Africa, Africa

Guadalupe fur seal (Arctocephalus townsendi), Isla San Pedro Martir, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Detail of decoration on traditional reed boat, floating islands, Islas Flotantes, Lake Titicaca, Peru, South America

A Spotted Moray Eel (Gymnothorax moringa) displays an open mouth as it protrudes it's head just outside a hole in a coral reef in the Atlantic Ocean off the coast of Key Largo, Florida.

Caribbean reef shark swallowing a lionfish, with mouth open and eyelids closed, Jardines De La Reina, Cuba.

Portrait of an American saltwater crocodile on the surface of a mangrove at sunset with mouth wide open, Jardines De La Reina, Cuba.

Whale shark coming up from the depths under the boat, mouth wide open, with sharp sunrays cutting through the water.

American saltwater crocodile (Crocodylus acutus) in mangrove with mouth open showing teeth, Jardines De La Reina, Cuba.

A sea lion, Zalophus Californianus, holds a sea star in its mouth, Sea of Cortez, Los Islotes, Mexico.

Long-tailed macaque (Macaca fascicularis), Bako National Park, Sarawak, Borneo, Malaysia, Southeast Asia, Asia

Northern (Steller) sea lion (Eumetopias jubatus) close-up eating a halibut in Southeastern Alaska, United States of America

Mute swans (Cygnus olor) on seashore at freshwater stream mouth, Arran, Scotland, United Kingdom, Europe

Spotted hyena (spotted hyaena) (Crocuta crocuta) with a baby Thomson's gazelle (Gazella thomsonii), Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Black-backed jackal (silver-backed jackal) (Canis mesomelas) carrying half a Thomson's gazelle (Gazella thomsonii) calf, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Greater kudu (Tragelaphus strepsiceros) buck with his mouth open, Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Adult San Esteban spiny-tailed iguana (Ctenosaura conspicuosa), endemic to Isla San Esteban, Baja California, Mexico, North America

Detail of a mushroom coral (Fungia sp.) on a reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

Chimpanzee (Pan troglodytes), Gombe Stream National Park, Lake Tanganyika, Tanzania, East Africa, Africa

Chimpanzee (Pan troglodytes), Gombe Stream National Park, Lake Tanganyika, Tanzania, East Africa, Africa

Close-up of a male lion (Panthera leo) yawning, Mala Mala Game Reserve, Sabi Sand Park, South Africa, Africa

Lion (Panthera leo) demonstrating the flehmen response, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

A male yellow barred jawfish (Opistognathus randalli), broods eggs in its mouth, Anilao, Philippines.

Guadalupe fur seals (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Fur seals sunning themselves on a rock at the mouth of Doubtful Sound, Fiordland, South Island, New Zealand, Pacific

This fish is having its gills cleaned by a cleaner wrasse so it opens wide allowing the fish to come in and feed on parasites, Raja Ampat, Indonesia.

South American black vulture (Coragyps atratus brasiliensis), a common scavenger, river mouth near Nosara, Nicoya Peninsula, Guanacaste Province, Costa Rica, Central America

Great Egret (Ardea alba) on left and little egret (Egretta garzetta) at Nosara Beach and river mouth, Nosara, Guanacaste, Costa Rica, Central America

Nile crocodile (Crocodylus niloticus) mouth open in the river Chobe, Chobe National Park, Botswana, Africa

Galapagos Giant Tortoise (Geochelone chatamensis), can live to 100 years, on San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Lion (Panthera leo) demonstrating the flehmen response, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Greater kudu (Tragelaphus strepsiceros) buck with his mouth open, Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Brown Pelican (Pelecanus occidentalis) looking for fish at Nosara Beach and river mouth, Nosara, Guanacaste Province, Costa Rica, Central America

A lioness (Panthera leo) moving a young cub by carrying it in her mouth, Masai Mara National Park, Kenya, East Africa, Africa

Lioness (Panthera leo), Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Lioness (Panthera leo) drinking, Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Masai giraffe (Giraffa camelopardalis tippelskirchi) cleaning its nose, Masai Mara National Reserve, Kenya, East Africa, Africa

A yellow baboon (Papio hamadryas cynocephalus) walking with some food in its mouth, Tsavo, Kenya, East Africa, Africa