Mouth images - Joel Sartore

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A hippopotamus bares its teeth at the Sedgwick County Zoo.

Nicobar pigeon, Caloenas nicobarica, at the Omaha Zoo.

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Nicobar pigeon, Caloenas nicobarica, at the Omaha Zoo.

A green tree python (Morelia viridis) at the Riverside Zoo.

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A green tree python (Morelia viridis) at the Riverside Zoo.

A fisher (Martes pennanti) at the New York State Zoo, Watertown, New York.

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A fisher (Martes pennanti) at the New York State Zoo, Watertown, New York.

A hippopotamus (Hippopotamus amphibius) at the San Antonio Zoo. (IUCN: Vulnerable).

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A hippopotamus (Hippopotamus amphibius) at the San Antonio Zoo. (IUCN: Vulnerable).

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An illustration of a stream of water coming out of the mouth of a young boy.

Picture of an Eastern collared lizard (Crotaphytus collaris collaris) at the Wichita Mountains National Wildlife Refuge near Lawton, OK.

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An Eastern collared lizard (Crotaphytus collaris collaris) at the Wichita Mountains National Wildlife Refuge near Lawton, OK.

Picture of a red-bellied piranha (Pygocentrus nattereri) at the Oklahoma City Zoo.

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Red-bellied piranha (Pygocentrus nattereri) at the Oklahoma City Zoo.

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Red-bellied piranha (Pygocentrus nattereri) at the Oklahoma City Zoo.

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Red-bellied piranha (Pygocentrus nattereri) at the Oklahoma City Zoo.

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Red-bellied piranha (Pygocentrus nattereri) at the Oklahoma City Zoo.

Picture of a sand cat (Felis margarita harrisoni) at the Tulsa Zoo.

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A sand cat (Felis margarita harrisoni) at the Tulsa Zoo.

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An American green anole or Carolina anole (Anolis carolinensis) at the Audubon Zoo in New Orleans, Louisiana.

A critically endangered and federally endangered male Western lowland gorilla (Gorilla gorilla gorilla) named Lamydoc, at the Gladys Porter Zoo in Brownsville, Texas. Lamydoc was born in 1963.

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A critically endangered and federally endangered male Western lowland gorilla (Gorilla gorilla gorilla) named Lamydoc, at the Gladys Porter Zoo in Brownsville, Texas. Lamydoc was born in 1963.

Picture of common dwarf mongooses (Helogale parvula) at the Omaha Henry Doorly Zoo.

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Common dwarf mongooses (Helogale parvula) at the Omaha Henry Doorly Zoo.

A female gray fox (Urocyon cinereoargenteus floridanus), This fox was taken to St. Francis Wildlife Association, a wildlife rescue center near Quincy, Florida, after it had been hit by a car.

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A female gray fox (Urocyon cinereoargenteus floridanus), This fox was taken to St. Francis Wildlife Association, a wildlife rescue center near Quincy, Florida, after it had been hit by a car.

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A female gray fox (Urocyon cinereoargenteus floridanus), This fox was taken to St. Francis Wildlife Association, a wildlife rescue center near Quincy, Florida, after it had been hit by a car.

Picture of a Marigold lorikeet (Trichoglossus capistratus) named Linguini at the Dallas Zoo.

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A Marigold lorikeet (Trichoglossus capistratus) named Linguini at the Dallas Zoo.

A near threatened Nicobar pigeon (Caloenas nicobarica) at Omaha's Henry Doorly Zoo and Aquarium, Omaha, Nebraska.

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A near threatened Nicobar pigeon (Caloenas nicobarica) at Omaha’s Henry Doorly Zoo and Aquarium, Omaha, Nebraska.

Picture of an endangered big-headed turtle (Platysternon megacephalum megacephalum) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

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An endangered big-headed turtle (Platysternon megacephalum megacephalum) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

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An endangered big-headed turtle (Platysternon megacephalum megacephalum) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

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An endangered big-headed turtle (Platysternon megacephalum megacephalum) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

Southeast Asian softshelled turtle (Amyda cartilaginea) a vulnerable species at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

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Southeast Asian softshelled turtle (Amyda cartilaginea) a vulnerable species at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

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An endangered big-headed turtle (Platysternon megacephalum megacephalum) at the National Mississippi River Museum and Aquarium in Dubuque, Iowa.

Picture of a federally endangered jaguarundi (Puma yagouaroundi) at Bear Creek Feline Center.

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A federally endangered jaguarundi (Puma yagouaroundi) at Bear Creek Feline Center.

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A federally endangered jaguarundi (Puma yagouaroundi) at Bear Creek Feline Center.

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A federally endangered jaguarundi (Puma yagouaroundi) at Bear Creek Feline Center.

A Southern screamer (Chauna torquata) at the Kansas City Zoo.

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A Southern screamer (Chauna torquata) at the Kansas City Zoo.

Picture of an endangered (IUCN) and federally endangered, 21-year-old, lion-tailed macaque (Macaca silenus) named Babu at the Cincinnati Zoo.

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An endangered (IUCN) and federally endangered, 21-year-old, lion-tailed macaque (Macaca silenus) named Babu at the Cincinnati Zoo. These primates are kept in very few zoos now and are rarer in the wilds of India each year.

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A teenage girl, 16, yells at the camera, Lincoln, Nebraska.

An Amur tiger (Panthera tigris altaica) at the Cheyenne Mountain Zoo. This animal is five years old, and named Grom by the zoo staff. Grom means thunder in russian. Listed as endangered (IUCN) and federally endangered.

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An Amur tiger (Panthera tigris altaica) at the Cheyenne Mountain Zoo. This animal is five years old, and named Grom by the zoo staff. Grom means thunder in russian. Listed as endangered (IUCN) and federally endangered.