Houston Zoo images - Joel Sartore

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A jade gliding frog (Rhacophorus prominanus) at the Houston Zoo.

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A Jamaican fruit bat (Artibeus jamaicensis) at the Houston Zoo.

A Masai giraffe (Giraffa camelopardalis tippelskirchi) at the Houston Zoo.

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A Masai giraffe (Giraffa camelopardalis tippelskirchi) at the Houston Zoo.

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A wall of Photo Ark images at the Houston Zoo.

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A northern red fan parrot (Deroptyus accipitrinus accipitrinus) at the Houston Zoo. This unusual Amazon basin parrot has a crown of brightly-colored head feathers it raises when it feels threatened or aggressive.

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A greater Madagascar tenrec (Setifer setosus) at the Houston Zoo.

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Damaraland mole rats (Fukomys damarensis) at the Houston Zoo. These burrowing rodents from sub-Saharan Africa are one of only two known eusocial mammals.

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A silver pheasant hen (Lophura nycthemera) at the Houston Zoo.

A red-billed leiothrix (Leiothrix lutea) at the Houston Zoo. This individual is very vocal and inquisitive.

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A red-billed leiothrix (Leiothrix lutea) at the Houston Zoo. This individual is very vocal and inquisitive.

A male and female tambourine dove (Turtur tympanistria) at the Houston Zoo. This pair is particularly nervous and have to be approached in a sensitive manner.

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A male and female tambourine dove (Turtur tympanistria) at the Houston Zoo. This pair is particularly nervous and have to be approached in a sensitive manner.

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Wonga pigeon (Leucosarcia melanoleuca ) at the Houston Zoo. This male likes to sit in the smallest nest (intended for finches) in the enclosure even when there are no eggs.

A crested quail-dove (Geotrygon versicolor) at the Houston Zoo.

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A crested quail-dove (Geotrygon versicolor) at the Houston Zoo.

A blue-winged kookaburra (Dacelo leachii) at the Houston Zoo. This bird does not appreciate keepers in his enclosure and attacks by flying at their head. He enjoys only the company of his mate and makes threat displays at everyone passing by.

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A blue-winged kookaburra (Dacelo leachii) at the Houston Zoo. This bird does not appreciate keepers in his enclosure and attacks by flying at their head. He enjoys only the company of his mate and makes threat displays at everyone passing by.

Picture of a critically endangered, female blue-knobbed curassow (Crax alberti) at the Houston Zoo

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A critically endangered, female blue-knobbed curassow (Crax alberti) at the Houston Zoo.

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A critically endangered, female blue-knobbed curassow (Crax alberti) at the Houston Zoo.

Picture of a critically endangered, male blue-knobbed curassow (Crax alberti) at the Houston Zoo

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A male blue-knobbed curassow (Crax alberti) at the Houston Zoo. In the wild, this critically-endangered species is found only in Colombia but this individual was hatched in captivity and is quite tame. He likes to offer treats in his bill to his keepers and makes a squeaking vocalization until the keeper takes the ‘gift’.

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Yellow-knobbed curassow (Crax daubentoni) at the Houston Zoo. This bird is over 20 years old and has fathered many offspring. The whistle of this species sounds like a bomb dropping in a cartoon.

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Yellow-knobbed curassow (Crax daubentoni) at the Houston Zoo. This bird is over 20 years old and has fathered many offspring. The whistle of this species sounds like a bomb dropping in a cartoon.

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Golden-fronted leafbird (Chloropsis aurifrons) at the Houston Zoo.

A male and female Madagascar button quail (Turnix nigricollis) at the Houston Zoo. This hen has laid many eggs but is not a big fan of her mate, although her mate is a big fan of hers.

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A male and female Madagascar button quail (Turnix nigricollis) at the Houston Zoo. This hen has laid many eggs but is not a big fan of her mate, although her mate is a big fan of hers.

An African pygmy falcon (Polihierax semitorquatus) at the Houston Zoo.

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An African pygmy falcon (Polihierax semitorquatus) at the Houston Zoo.

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A great hornbill (Buceros bicornis) at the Houston Zoo.

A violet-backed starling (Cinnyricinclus leucogaster) at the Houston Zoo. Though bright purple in sunlight, this bird is extremely difficult to see in the shade of the forest.

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A violet-backed starling (Cinnyricinclus leucogaster) at the Houston Zoo. Though bright purple in sunlight, this bird is extremely difficult to see in the shade of the forest.