in a row images - Joel Sartore

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BIR064-00240

Two male saffron finches (Sicalis flaveola brasiliensis) at the Membeca Lagos Farm, near Rio de Janeiro, Brazil.

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BIR064-00239

Saffron finches (Sicalis flaveola brasiliensis) at the Membeca Lagos Farm, near Rio de Janeiro, Brazil. The female is more brown, the males more brilliant yellow.

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ANI069-00031

Three juvenile common opossum (Didelphis marsupialis) at Cetas-IBAMA, a wildlife rehab center in Manaus, Brazil. This is administered by IBAMA, the government wildlife agency of Brazil.

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ANI064-00105

Gelada baboons (Theropithecus gelada) at Parco Natura Viva in Bussolengo, Italy.

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ANI064-00108

Gelada baboons (Theropithecus gelada) at Parco Natura Viva in Bussolengo, Italy.

Picture of an opossum (Didelphis virginiana) with babies.

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ANI051-00206

An opossum (Didelphis virginiana) with babies at the Nebraska Wildlife Rehab.

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PEO003-00445

Elementary age boys and girls on horses.

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PEO020-00245

Three young women light fire crackers in Bennet, Nebraska.

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PEO020-00247

Three young women run through smoke bomb fire crackers in Bennet, Nebraska.

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SPO008-00062

Rodeo queens on horses stand at the rodeo entrance gates.

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BIR050-00070

A mated pair of spot-billed toucanets (Selenidera maculirostris) at the Dallas World Aquarium. The male is mostly black, with more brown in the female.

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SCE054-00106

Lions meet the robocar in Queen Elizabeth National Park.

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

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ANI035-00009

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

Picture of a row of critically endangered ploughshare tortoises (Astrochelys yniphora) at Zoo Atlanta.

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ANI080-00082

A row of critically endangered ploughshare tortoises (Astrochelys yniphora) at Zoo Atlanta. These animals were confiscated after being stolen. They are valued at about $10,000 each.

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ESA002-00340

Aquariums containing many rare and endangered fish species at Conservation Fisheries, a native stream fish breeding center.

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ESA002-00270

Flattened musk turtles (Sternotherus depressus) (IUCN: Vulnerable, US: Threatened) at the Tennessee Aquarium, Chattanooga, Tennessee.

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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.