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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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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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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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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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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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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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SCE054-00126

A crew tranquilizes and radio collars a lion for monitoring.

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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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ESA002-00097

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

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Two pallid foxes (Vulpes pallida) at Cub Creek Science Camp in Rolla, MO.

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VMAM001-009

Two pallid foxes (Vulpes pallida) at Cub Creek Science Camp in Rolla, MO.

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

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ANI019-00412

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

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A black-throated monitor (Varanus albigularis microstictus) named Vulture, at Cub Creek Science Camp in Rolla, MO.

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VREP003-010

A black-throated monitor (Varanus albigularis microstictus) named Vulture, at Cub Creek Science Camp in Rolla, MO.

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ANI050-00056

An Indian rhino at the Rolling Hills Wildlife Adventure in Salina, KS

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BIR041-00004

A collared raven (Corvus albicollis) at Reptile Gardens.

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An adult and juvenile member of the Habinyanja family of gorillas, one of four semi-habituated families who will tolerate humans in their presence. This family group makes its home at the north end of Bwindi Impenetrable Forest National Park.

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ANI053-00012

An adult and juvenile member of the Habinyanja family of gorillas, one of four semi-habituated families who will tolerate humans in their presence. This family group makes its home at…

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A juvenile brush-tailed bettong (Bettongia penicillata) named Bo, at Cub Creek Science Camp in Rolla, MO. This species is listed as critically endangered by IUCN.

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VMAM008-011

A juvenile brush-tailed bettong (Bettongia penicillata) named Bo, at Cub Creek Science Camp in Rolla, MO. This species is listed as critically endangered by IUCN.

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Joel Sartore with a long-snouted robber frog (Pristimantis appendiculatus) in the cloud forest reserve near Mindo, Ecuador.

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SCE048-00025

Joel Sartore with a long-snouted robber frog (Pristimantis appendiculatus) in the cloud forest reserve near Mindo, Ecuador.

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FIS011-00218

A largescale stoneroller (Campostoma oligolepis).

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BIR004-00083

A yellow-collared macaw (Primolius auricollis) at the Sedgwick County Zoo.

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A brown-nosed coatimundi (Nasua nasua solitaria) at the Miller Park Zoo in Bloomington, Illinois.

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ANI062-00199

A brown-nosed coatimundi (Nasua nasua solitaria) at the Miller Park Zoo in Bloomington, Illinois.

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FIS011-00223

A studio portait of a largescale stoneroller (Campostoma oligolepis).

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Collared peccaries (Pecari tajacu) at the Lee G. Simmons Conservation Park and Wildlife Safari.

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ANI015-00014

Collared peccaries (Pecari tajacu) at the Lee G. Simmons Conservation Park and Wildlife Safari.

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FIS011-00217

A largescale stoneroller (Campostoma oligolepis).

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FIS011-00216

A largescale stoneroller (Campostoma oligolepis).

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FIS011-00215

A largescale stoneroller (Campostoma oligolepis).

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BIR033-00389

A northern double-collared sunbird (Cinnyris reichenowi preussi) in Bioko Island Equatorial Guinea.

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The endangered grey gibbon (Hylobates muelleri muelleri) may 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'.

Photo

ESA002-00104

The endangered grey gibbon (Hylobates muelleri muelleri) may not be seen in captivity much longer. There are now too few in captivity to keep their population sustained and too few…

View Photo