horizontal images - Joel Sartore

A wild caterpillar in Bioko Island, Equatorial Guinea.

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ANI079-00008

A wild caterpillar in Bioko Island, Equatorial Guinea.

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El Segundo flower-loving fly (Rhaphiomidas terminatus terminatus). This insect was thought to be extinct since the end of the 1960s but a small remnant population of less than 100 individuals was discovered in the early 2000s.

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A federally endangered timber wolf (Canis lupus) named Kenai at the New York State Zoo.

A picture of a mallard duckling (Anas platyrhynchos platyrhynchos) at Wildlife Rescue Team Inc. in Lincoln, Nebraska.

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A mallard duckling (Anas platyrhynchos platyrhynchos) at Wildlife Rescue Team Inc. in Lincoln, Nebraska.

A white pelican (Pelecanus erythrorhynchos).

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Portrait of a white pelican (Pelecanus erythrorhynchos) photographed with the Wildlife Rescue Team in Nebraska.

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A five-month-old mandrill (Mandrillus sphinx) in Malabo, Equatorial Guinea. The species is listed as vulnerable by IUCN.

A bog turtle (Glyptemys muhlenbergii) an endangered (IUCN) and federally threatened species at the Atlanta Zoo.

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A bog turtle (Glyptemys muhlenbergii) an endangered (IUCN) and federally threatened species at the Atlanta Zoo.

A fruit bat (Lissonycteris angolensis) hanging with wings folded, from Bioko Island, Equatorial Guinea.

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ANI079-00237

A fruit bat (Lissonycteris angolensis) hanging with wings folded, from Bioko Island, Equatorial Guinea.

A volcano rabbit (Romerolagus diazi) at Chapultepec Zoo in Mexico City. (IUCN: Endangered)

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A volcano rabbit (Romerolagus diazi) at Chapultepec Zoo in Mexico City. (IUCN: Endangered)

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A volcano rabbit (Romerolagus diazi) at Chapultepec Zoo in Mexico City. (IUCN: Endangered)

Portrait of a white pelican (Pelecanus erythrorhynchos).

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BIR017-00037

Portrait of a white pelican (Pelecanus erythrorhynchos) photographed with the Wildlife Rescue Team in Nebraska.

A picture of an American kestrel (Falco sparverius sparverius) at the Lincoln Children's Zoo.

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An American kestrel (Falco sparverius sparverius) at the Lincoln Children’s Zoo.

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A wild caught orangethroat darter (Etheostoma spectabile) in Missouri.

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Bull trout (Salvelinus confluentus) swimming in the Bighorn Creek, in the Wigwam River drainage in British Columbia. This is one of the last, best places for spawning of the vulnerable (ICUN) and federally-threatened bull trout, and is part of the Kootenay River system, which sees an annual migration of bull trout from Lake Koocanusa, some fifty miles away. The fish prefer very cold water of 40 degrees or so in order to spawn, and the springs in this area provide that. Ram Creek flows into the Wigwam, and between the two of them they support some 5,000 bull trout.

A common five-lined skink (Plestiodon fasciatus) collected from the Conasauga River.

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A common five-lined skink (Plestiodon fasciatus) collected from the Conasauga River.

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A common five-lined skink (Plestiodon fasciatus) collected from the Conasauga River.

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A common five-lined skink (Plestiodon fasciatus) collected from the Conasauga River.

A pronghorn (Antilocapra americana) crossing under a fence near Medicine Hat, Alberta, Canada.

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ANI082-00109

A pronghorn (Antilocapra americana) crossing under a fence near Medicine Hat, Alberta, Canada.

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.

Picture of an endangered Asian elephant (Elephas maximus).

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An endangered Asian elephant (Elephas maximus).

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For the first time in decades, wolves again chase elk through the Lamar Valley of Yellowstone. The reintroduction of wolves has been a great success, drawing a new generation of visitors to the park.