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An endangered (IUCN) relict leopard frog (Rana onca) caught near the Hoover Dam. This animal's habitat has been reduced over the years substantially. Though it is a candidate species for federal protection, federal and state agencies are working to ensure that it doesn't need to be listed.

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An endangered (IUCN) relict leopard frog (Rana onca) caught near the Hoover Dam. This animal’s habitat has been reduced over the years substantially. Though it is a candidate species for federal protection, federal and state agencies are working to ensure that it doesn’t need to be listed.

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A red-footed booby (Sula sula) with vegetation for nesting on Tower Island in Galapagos National Park.

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Lonesome George, the very last of the Pinta Island tortoises (Chelonoidis nigra abingdoni) on Santa Cruz Island, on the edge of Galapagos National Park.

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A pair of waved albatross, also known as Galapagos Albatross, (Phoebastria irrorata) in one of the primary nesting grounds on Espanola Island in Galapagos National Park. This species nests only on the island of Espanola and one other small island in the Galapagos.

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Picture of an American flamingo (Phoenicopterus ruber), in the Floreana Island in Galapagos National Park.

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An American flamingo (Phoenicopterus ruber), in the Floreana Island in Galapagos National Park.

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A Galapagos sea lion (Zalophus wollebaeki) on Espanola Island in Galapagos National Park.

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A Galapagos sea lion (Zalophus wollebaeki) on Espanola Island in Galapagos National Park.

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A Galapagos sea lion (Zalophus wollebaeki) around Puerto Egas, Santiago Island in Galapagos National Park.

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A Galapagos sea lion (Zalophus wollebaeki) around Puerto Egas, Santiago Island in Galapagos National Park.

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A Galapagos sea lion (Zalophus wollebaeki) around Puerto Egas, Santiago Island in Galapagos National Park.

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One of the rarest birds in the world, the lava gull (Leucophaeus fuliginosus) on Santa Cruz Island, on the edge of Galapagos National Park.

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A AMarine iguana (Amblyrhynchus cristatus) on Fernandina Island in Galapagos National Park.

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Close up of a Galapagos Land Iguana (Conolophus subcristatus) on North Seymour Island, part of Galapagos National Park.

Arabian oryx, Oryx leucoryx, at the Phoenix Zoo. This species is listed as vulnerable.

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Arabian oryx, Oryx leucoryx, at the Phoenix Zoo. This species is listed as vulnerable.

An endangered Malayan tiger, Panthera tigris jacksoni, at the Omaha Zoo.

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An endangered Malayan tiger, Panthera tigris jacksoni, at the Omaha Zoo.

An endangered (IUCN) and federally endangered San Esteban chuckwalla, Sauromalus varius, at the Arizona Sonora Desert Museum

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An endangered (IUCN) and federally endangered San Esteban chuckwalla, Sauromalus varius, at the Arizona Sonora Desert Museum

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An endangered (IUCN) and federally endangered San Esteban chuckwalla, Sauromalus varius, at the Arizona Sonora Desert Museum

A ringed map turtle, Graptemys oculifera, at the National Mississippi River Museum and Aquarium in Dubuque, IA. This species is listed as endangered (IUCN) and federally threatened.

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A ringed map turtle, Graptemys oculifera, at the National Mississippi River Museum and Aquarium in Dubuque, IA. This species is listed as endangered (IUCN) and federally threatened.

A picture of an Eastern indigo snake, Drymarchon couperi, at the Toledo Zoo. This species is federally threatened.

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Eastern indigo snake, Drymarchon couperi, at the Toledo Zoo. This species is federally threatened.

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Eastern indigo snake, Drymarchon couperi, at the Toledo Zoo. This species is federally threatened.

A federally endangered Salt Creek tiger beetle (Cicindela nevadica lincolniana) in a lab at the University of Nebraska-Lincoln. With a count of fewer than 250 adults in the summer of 2007, this subspecies of tiger beetle could be the rarest insect in North America. Found only in the interior saline wetlands of Lancaster County, Nebraska, the beetle has been in decline for years due to habitat loss from development.

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A federally endangered Salt Creek tiger beetle (Cicindela nevadica lincolniana) in a lab at the University of Nebraska-Lincoln. With a count of fewer than 250 adults in the summer of 2007, this subspecies of tiger beetle could be the rarest insect in North America. Found only in the interior saline wetlands of Lancaster County, Nebraska, the beetle has been in decline for years due to habitat loss from development.

An endangered (IUCN) and federally endangered Virgin Islands boa (Chilabothrus granti) at Toledo Zoo.

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An endangered (IUCN) and federally endangered Virgin Islands boa (Chilabothrus granti) at Toledo Zoo.

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An endangered (IUCN) and federally endangered Virgin Islands boa (Chilabothrus granti) at Toledo Zoo.

Smoky madtom (Noturus baileyi) is a federally endangered species at Conservation Fisheries, a native stream fish breeding center. This species is listed as vulnerable on IUCN.

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Smoky madtom (Noturus baileyi) is a federally endangered species at Conservation Fisheries, a native stream fish breeding center. This species is listed as vulnerable on IUCN.

Cape Fear shiner (Notropis mekistocholas) an endangered (IUCN) and federally endangered species at Conservation Fisheries, a native stream fish breeding center.

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Cape Fear shiner (Notropis mekistocholas) an endangered (IUCN) and federally endangered species at Conservation Fisheries, a native stream fish breeding center.