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In vogue no more, the endangered grey gibbon (Hylobates muelleri muelleri) will not be seen in captivity much longer. There are now too few in captivity to keep their population sustained and too few in the wild to bring more in. With limited space and funding, zoos must make hard choices every year in deciding which species to breed and which to let go, or 'phase out'. Often zoos go with more showy species of primate to propagate, leaving the fate of the more drab species in question.

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ANI040-00140

In vogue no more, the endangered grey gibbon (Hylobates muelleri muelleri) will not be seen in captivity much longer. There are now too few in captivity to keep their population…

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ANI106-00021

A female Colombian red Howler Monkey (Alouatta seniculus seniculus) at Cafam Zoo in Melgar, Colombia.

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A veiled chameleon (Chamaeleo calyptratus) at the Rolling Hills Wildlife Adventure.

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ANI017-00121

A veiled chameleon (Chamaeleo calyptratus) at the Rolling Hills Wildlife Adventure.

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A Miller's Saki (Pithecia milleri) at the Cafam Zoo in Colombia.

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ANI106-00024

A Miller's Saki (Pithecia milleri) at the Cafam Zoo in Colombia.

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ANI106-00026

A Miller's Saki (Pithecia milleri) at the Cafam Zoo in Colombia.

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ANI106-00020

A female Colombian red Howler Monkey (Alouatta seniculus seniculus) at Cafam Zoo in Melgar, Colombia.

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ANI106-00025

A Miller's Saki (Pithecia milleri) at the Cafam Zoo in Colombia.

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ANI065-00046

A Rowley's palm pit viper (Bothriechis rowleyi) at the St. Louis Zoo.

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An endangered (IUCN) and federally threatened female Guatemalan mantled howler (Alouatta pigra) at the Gladys Porter Zoo in Brownsville, Texas.

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ANI040-00372

An endangered (IUCN) and federally threatened female Guatemalan mantled howler (Alouatta pigra) at the Gladys Porter Zoo in Brownsville, Texas.

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Red-eyed tree frog (Agalychnis callidryas) at the Miller Park Zoo.

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ANI078-00348

Red-eyed tree frog (Agalychnis callidryas) at the Miller Park Zoo.

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Picture of a vulnerable red collared brown lemur (Eulemur collaris) at the Omaha Zoo.

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ANI042-00013

vulnerable red collared brown lemur (Eulemur collaris) at the Omaha Zoo.

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A critically endangered (IUCN) and federally endangered Sumatran tiger (Panthera tigris sumatrae) at the Miller Park Zoo.

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ESA002-00098

A critically endangered (IUCN) and federally endangered Sumatran tiger (Panthera tigris sumatrae) at the Miller Park Zoo.

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ANI065-00047

A Rowley's palm pit viper (Bothriechis rowleyi) at the St. Louis Zoo.

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FIS021-00045

A common sand dollar, Echinarachnius parma, at the Alaska SeaLife Center.

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PEO003-00166

The greenish yellow light of an impending thunderstorm rolls in over a partially-harvested wheat field near Haysville, KS.

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ANI065-00043

A Rowley's palm pit viper (Bothriechis rowleyi) at the St. Louis Zoo.

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Picture of a Bobcat (Lynx rufus) at the Miller Park Zoo.

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ANI019-00256

Bobcat (Lynx rufus) at the Miller Park Zoo.

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PEO002-00023

Members of a Wayne State College fraternity are transformedinto the "Chickendale" Dancers at the Wayne Chicken festival in Nebraska.

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Picture of a vulnerable collared brown lemur (Eulemur collaris) at Omaha's Henry Doorly Zoo and Aquarium.

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ANI042-00071

A vulnerable collared brown lemur (Eulemur collaris) at Omaha's Henry Doorly Zoo and Aquarium.

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Red-eyed tree frog (Agalychnis callidryas) at the Miller Park Zoo. These frogs sit completely still all day long and blend in with the surrounding leaves. They have the ability to change the green tint of their skin to make it harder for predators to see them.

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ANI101-00198

Red-eyed tree frog (Agalychnis callidryas) at the Miller Park Zoo. These frogs sit completely still all day long and blend in with the surrounding leaves. They have the ability to…

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A reindeer (Rangifer tarandus) at the Miller Park Zoo in Bloomington, Illinois.

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ANI003-00074

A reindeer (Rangifer tarandus) at the Miller Park Zoo in Bloomington, Illinois.

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ANI003-00077

A reindeer (Rangifer tarandus) at the Miller Park Zoo.

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SCE054-00126

A crew tranquilizes and radio collars a lion for monitoring.

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A picture of a Northern grasshopper mouse, or killer mouse (Onychomys lleucogaster breviauritus) at Cedar Point Biological Station.

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ANI084-00042

Northern grasshopper mouse, or killer mouse (Onychomys lleucogaster breviauritus) at Cedar Point Biological Station.

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ANI101-00199

Red-eyed tree frog (Agalychnis callidryas) at the Miller Park Zoo. These frogs sit completely still all day long and blend in with the surrounding leaves. They have the ability to…

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An endangered (IUCN) and federally endangered snow leopard (Panthera uncia) at the Miller Park Zoo.

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ANI019-00534

An endangered (IUCN) and federally endangered snow leopard (Panthera uncia) at the Miller Park Zoo.

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ANI017-00320

A chuckwalla (Sauromalus ater) at the Rolling Hills Wildlife Adventure, Salina, Kansas.

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ANI017-00459

A critically endangered Jamaican iguana (Cyclura collei) at the Indianapolis Zoo.

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ESA002-00097

A critically endangered (IUCN) and federally endangered Sumatran tiger (Panthera tigris sumatrae) at the Miller Park Zoo.

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Picture of an Eastern collared lizard (Crotaphytus collaris collaris) at the Wichita Mountains National Wildlife Refuge near Lawton, OK.

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ANI073-00605

An Eastern collared lizard (Crotaphytus collaris collaris) at the Wichita Mountains National Wildlife Refuge near Lawton, OK.

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Picture of a common squirrel monkey (Saimiri sciureus sciureus) named Chili at the Santa Fe College Teaching Zoo.

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ANI040-00452

A common squirrel monkey (Saimiri sciureus sciureus) named Chili at the Santa Fe College Teaching Zoo.

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An endangered (IUCN) and federally endangered snow leopard (Panthera uncia) named Rilu at the Miller Park Zoo. He likes to play hide and seek with his keepers every night during closing, and is very protective of his exhibit mate.

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ANI105-00008

An endangered (IUCN) and federally endangered snow leopard (Panthera uncia) named Rilu at the Miller Park Zoo. He likes to play hide and seek with his keepers every night during…

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