Joel Sartore Joel Sartore

National Geographic Photographer and Speaker

Keyword: Cave

Mexican free-tailed bats (Tadarida brasiliensis) swirl out of the Eckert James River Bat Cave at sunset to feed on insects. This maternity colony builds to more than 6 million bats in late July, making it one of the largest in the world. It is owned and managed by The Nature Conservancy.

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Mexican free-tailed bats (Tadarida brasiliensis) swirl out of the Eckert James River Bat Cave at sunset to feed on insects. This maternity colony builds to more than 6 million bats in late July, making it one of the largest in the world. It is owned and managed by The Nature Conservancy.

Mexican free-tailed bats (Tadarida brasiliensis) swirl out of the Eckert James River Bat Cave at sunset to feed on insects. This maternity colony builds to more than 6 million bats in late July, making it one of the largest in the world. It is owned and managed by The Nature Conservancy.

Photo

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Mexican free-tailed bats (Tadarida brasiliensis) swirl out of the Eckert James River Bat Cave at sunset to feed on insects. This maternity colony builds to more than 6 million bats in late July, making it one of the largest in the world. It is owned and managed by The Nature Conservancy.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: An expedition guide standing in a coastal cave along Bioko Island, Equatorial Guinea.

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An expedition guide standing in a coastal cave along Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: A coastal cave filled with what most likely are Noack's roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

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A coastal cave filled with what most likely are Noack’s roundleaf bats (Hipposideros ruber) in Bioko Island, Equatorial Guinea.

Photo: The endangered Texas blind cave salamander, Eurycea rathbuni.

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The endangered Texas blind cave salamander, Eurycea rathbuni. (Captive)

Photo: The endangered Texas blind cave salamander, Eurycea rathbuni.

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The endangered Texas blind cave salamander, Eurycea rathbuni. (Captive)

Photo: The endangered Texas blind cave salamander, Eurycea rathbuni.

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The endangered Texas blind cave salamander, Eurycea rathbuni. (Captive)

Photo: The endangered Texas blind cave salamander, Eurycea rathbuni.

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The endangered Texas blind cave salamander, Eurycea rathbuni. (Captive)

Photo: The endangered Texas blind cave salamander, Eurycea rathbuni.

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The endangered Texas blind cave salamander, Eurycea rathbuni. (Captive)

Photo: The endangered Texas blind cave salamander, Eurycea rathbuni.

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The endangered Texas blind cave salamander, Eurycea rathbuni. (Captive)

Photo: The endangered Texas blind cave salamander, Eurycea rathbuni.

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The endangered Texas blind cave salamander, Eurycea rathbuni. (Captive)

Photo: The endangered Texas blind cave salamander, Eurycea rathbuni.

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The endangered Texas blind cave salamander, Eurycea rathbuni. (Captive)

Photo: The endangered Texas blind cave salamander, Eurycea rathbuni.

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The endangered Texas blind cave salamander, Eurycea rathbuni. (Captive)

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