Race images - Joel Sartore

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Scene from the wild horse races at Nebraska’s Big Rodeo in Burwell.

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Madagascar hissing roaches pull tiny tractors at the Indiana state fair.

Portrait of an eastern hellbender (Cryptobranchus alleganiensis alleganiensis) at the San Francisco State University.

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Portrait of an eastern hellbender (Cryptobranchus alleganiensis alleganiensis) at the San Francisco State University.

A marsupial frog (Gastrotheca pseustes) at a captive breeding at Pontificia Universidad Catolica in Quito, Ecuador. (IUCN: EN)

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A marsupial frog (Gastrotheca pseustes) at a captive breeding at Pontificia Universidad Catolica in Quito, Ecuador. (IUCN: EN)

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A care taker holds up a specimen of Gastrotheca pseutes at a captive breeding at Pontificia Universidad Catòlica in Quito, Ecuador. (IUCN: EN)

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Portraits of Hyloscirtus pantostictus at a captive breeding at Pontificia Universidad Catòlica in Quito, Ecuador. This is an endangered frog. This is the only one in captivity and it could be extinct in the wild. (IUCN: EN)

Picture of a Oophaga sylvatica, the "little devil poison frog" at a captive breeding facility at Pontificia Universidad Catolica in Quito, Ecuador.

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Oophaga sylvatica, the “little devil poison frog” at a captive breeding facility at Pontificia Universidad Catolica in Quito, Ecuador. The species is being heavily affected by habitat loss.

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Extinct species of amphibians at Pontificia Universidad Catòlica in Quito, Ecuador. Many have gone extinct in the last decade or less.

Ceratophrys stolzmanni, the Pacific horned frog, an endemic burrowing species at the captive breeding facility in Quito, Ecuador. (IUCN: Vulnerable)

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Ceratophrys stolzmanni, the Pacific horned frog, an endemic burrowing species at the captive breeding facility in Quito, Ecuador. (IUCN: Vulnerable)

A rare male Atelopus frog is swabbed for chytrid fungus by a scientist near Limon, Ecuador.

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A rare male Atelopus frog is swabbed for chytrid fungus by a scientist near Limon, Ecuador.

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Pristimantis sp. photographed at Reserva Las Gralarias, Ecuador.

Ornate horned frog (Ceratophrys ornata) at the Tennessee Aquarium.

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Ornate horned frog (Ceratophrys ornata) at the Tennessee Aquarium.

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A boy in a “midget racer.”

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A boy in a “midget racer.”

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A boy in a “midget racer.”

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A boy in a “midget racer.”

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A boy in a “midget racer.”

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A boy in a “midget racer.”

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A “diaper derby” is held in a town park in Richfield, Utah.

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Members of the Wiltshire Fire Brigade enjoy a pint at a British pub while sharing their experiences and toasting their victory.

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Members of the Wiltshire Fire Brigade enjoy a pint at a British pub while sharing their experiences and toasting their victory.

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Members of the Wiltshire Fire Brigade laugh and smile while wearing Scottish hats and red wigs on Ben Nevis.

Critically endangered (IUCN) lemur leaf frogs (Hylomantis lemur), from the Panama, population, at Zoo Atlanta. This male and female frog are in amplexus, a state in which the male latches onto the female prior to egg laying and fertilization.

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Critically endangered (IUCN) lemur leaf frogs (Hylomantis lemur), from the Panama, population, at Zoo Atlanta. This male and female frog are in amplexus, a state in which the male latches onto the female prior to egg laying and fertilization.