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Like all gibbons, the gray gibbon has unusually long arms which are used to move through trees and to forage. This endangered species is being 'phased out' at zoos because there are too few in captivity to keep bloodlines vital and the species isn't showy.

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ESA002-00105

Like all gibbons, the gray gibbon has unusually long arms which are used to move through trees and to forage. This endangered species is being 'phased out' at zoos because…

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

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ANI019-00234

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

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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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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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ANI019-00235

An endangered (IUCN) and federally endangered snow leopard (Panthera uncia) 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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ANI019-00536

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

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ANI019-00535

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

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Picture of a common collared lizard (Crotaphytus collaris) at the Sedgwick County Zoo in Wichita, Kansas

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ANI073-00666

A common collared lizard (Crotaphytus collaris) at the Sedgwick County Zoo in Wichita, Kansas

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ANI103-00003

A killer whale also called an orca whale, Orcinus orca, named Kayla at SeaWorld in Orlando, FL. Kayla is 27 years old, weighs 5,600 pounds and is 19 feet long.

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