Joel Sartore Joel Sartore

National Geographic Photographer and Speaker

Keyword: slime

Photo: A partula snail (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium.

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A partula snail (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium.

This species is listed as extinct in the wild on the IUCN Red List.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

A Stock Island tree snail (Orthalicus reses reses), a federally-threatened species.

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A Stock Island tree snail (Orthalicus reses reses), a federally-threatened species.

A federally threatened Stock Island tree snail (Orthalicus reses reses).

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A federally threatened Stock Island tree snail (Orthalicus reses reses).

A close up of a banded tree snail (Orthalicus floridensis) from Crocodile Lake National Wildlife Refuge on Key Largo.

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A close up of a banded tree snail (Orthalicus floridensis) from Crocodile Lake National Wildlife Refuge on Key Largo.

The federally endangered Iowa Pleistocene Snail (Discus macclintocki). This is a relict from the last ice age, some 400,000 years ago. It lives in cold air vents on 37 different hillsides in Iowa (and one in Illinois) and survives only in the cold air that blows past underground ice and out of the cracks in limestone cliffs.

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The federally endangered Iowa Pleistocene Snail (Discus macclintocki). This is a relict from the last ice age, some 400,000 years ago. It lives in cold air vents on 37 different hillsides in Iowa (and one in Illinois) and survives only in the cold air that blows past underground ice and out of the cracks in limestone cliffs.

A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

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A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

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A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

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A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

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A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

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A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

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A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

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A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

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A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

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A mudskipper (Periophthalmus sp.) on Bioko Island, Equatorial Guinea.

Amber snail (most likely the oval ambersnail, Succinea ovalis) Two Rivers State Recreation Area.

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Amber snail (most likely the oval ambersnail, Succinea ovalis) Two Rivers State Recreation Area.

Amber snail (most likely the oval ambersnail, Succinea ovalis) Two Rivers State Recreation Area.

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Amber snail (most likely the oval ambersnail, Succinea ovalis) Two Rivers State Recreation Area.

Amber snail (most likely the oval ambersnail, Succinea ovalis) Two Rivers State Recreation Area.

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Amber snail (most likely the oval ambersnail, Succinea ovalis) Two Rivers State Recreation Area.

Amber snail (most likely the oval ambersnail, Succinea ovalis) Two Rivers State Recreation Area.

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Amber snail (most likely the oval ambersnail, Succinea ovalis) Two Rivers State Recreation Area.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

Partula snails (Partula nodosa) at the St. Louis Zoo's Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

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Partula snails (Partula nodosa) at the St. Louis Zoo’s Monsanto Insectarium. Once found in French Polynesia, this species is now extinct in the wild.

Photo: A giant Chinese tree frog (Rhacophorus dennysi) at Reptile Gardens.

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A giant Chinese tree frog (Rhacophorus dennysi) at Reptile Gardens.

Photo: A gray tree frog (Hyla versicolor) at the aquarium at Gavins Point National Fish Hatchery.

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A gray tree frog (Hyla versicolor) at the aquarium at Gavins Point National Fish Hatchery.

Photo: A gray tree frog (Hyla versicolor) at the aquarium at Gavins Point National Fish Hatchery.

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A gray tree frog (Hyla versicolor) at the aquarium at Gavins Point National Fish Hatchery.

Photo: A gray tree frog (Hyla versicolor) at the aquarium at Gavins Point National Fish Hatchery.

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A gray tree frog (Hyla versicolor) at the aquarium at Gavins Point National Fish Hatchery.

Photo: A gray tree frog (Hyla versicolor) at the aquarium at Gavins Point National Fish Hatchery.

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A gray tree frog (Hyla versicolor) at the aquarium at Gavins Point National Fish Hatchery.

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