onca images - Joel Sartore

A biologist holds up an endangered (IUCN) relict leopard frog (Lithobates onca) 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 biologist holds up an endangered (IUCN) relict leopard frog (Lithobates onca) 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.

An endangered (IUCN) relict leopard frog (Lithobates 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 (Lithobates 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.

An endangered (IUCN) relict leopard frog (Lithobates 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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ANI025-00498

An endangered (IUCN) relict leopard frog (Lithobates 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.

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.

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.

An endangered (IUCN) relict leopard frog (Lithobates 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.

Photo

ANI025-00496

An endangered (IUCN) relict leopard frog (Lithobates 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.

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.

Photo

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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.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

ANI019-00190

A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

ANI019-00186

A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

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A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Picture of a federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

Photo

ANI019-00180

A federally endangered jaguar (Panthera onca) at the Chapultepec Zoo in Mexico City.

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