Pair images - Joel Sartore

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INV003-00261

A female and male Sangihe black (Lampropelma nigerrimum) from a private collection.

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INS005-00349

A pair of Philippine walking stick (Lonchodes philippinicus) at Zoo Plzen in the Czech Republic. The male is smaller.

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INS005-00347

A pair of Philippine walking stick (Lonchodes philippinicus) at Zoo Plzen in the Czech Republic. The male is smaller.

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INS005-00346

A male and female Philippine walking stick (Lonchodes philippinicus) at Zoo Plzen in the Czech Republic. The male is very small.

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BIR039-00268

A pair of house finch (Haemorhous mexicanus frontalis) at Rogers Wildlife Rehabilitation in Hutchins, TX. The male has a red breast.

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BIR039-00266

A pair of house finch (Haemorhous mexicanus frontalis) at Rogers Wildlife Rehabilitation in Hutchins, TX. The male has a red breast.

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BIR045-00121

A pair of masked bobwhite quail (Colinus virginianus ridgwayi) at the Sutton Avian Research Center near Bartlesville, Oklahoma. The male has a black mask and the hen has a cream colored face.

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BIR045-00115

A pair of masked bobwhite quail (Colinus virginianus ridgwayi) at the Sutton Avian Research Center near Bartlesville, Oklahoma. The male has a black mask and the hen has a cream colored face.

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ANI110-00281

A pair of critically endangered Costa Rican lemur leaf frogs (Agalychnis lemur) Photographed at the Amphibian Foundation in Atlanta, Georgia. The male is smaller.

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ANI110-00280

A pair of critically endangered Costa Rican lemur leaf frogs (Agalychnis lemur) Photographed at the Amphibian Foundation in Atlanta, Georgia. The male is smaller.

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ANI110-00278

A pair of critically endangered San Martin fringe-limbed treefrogs (Ecnomiohyla valancifer) photographed at the Amphibian Foundation in Atlanta, Georgia. The male is larger.

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BIR069-00188

A male chestnut-bellied blue scale quail (Callipepla squamata castanogastris) from a private collection.

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BIR069-00174

A pair of Madagascar partridges (Margaroperdix madagarensis) from a private collection. The male has a darker face.

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BIR069-00173

A pair of Madagascar partridges (Margaroperdix madagarensis) from a private collection. The male has a darker face.

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BIR069-00147

A pair of true silver pheasants (Lophura nycthemera nycthemera) from the private collection.

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BIR069-00146

A pair of true silver pheasants (Lophura nycthemera nycthemera) from a private collection.

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BIR069-00141

A pair of Soemmerring’s copper pheasants (Syrmaticus soemmerringii soemmerringii) from a private collection.

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BIR069-00134

A pair of Ijima’s copper pheasants (Syrmaticus soemmerringii ijimae) from a private collection.

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ANI004-00151

A pair of pallid foxes (Vulpes pallida) at Cub Creek Science Camp in Rolla, MO. The female on the left is named Pallida and the male on the right in named Gadget.

This species is not well-studied. They come from Sub-Saharan Africa. Their large ears not only assist with hearing prey and threats, but serve to regulate their body temperature.

Cub Creek Science Camp is a residential animal and science summer camp located in central Missouri. Here children from all over the world come to learn about the Earth’s creatures and to gain an appreciation for science and nature.

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ANI004-00150

A pair of pallid foxes (Vulpes pallida) at Cub Creek Science Camp in Rolla, MO. The female on the left is named Pallida and the male on the right in named Gadget.

This species is not well-studied. They come from Sub-Saharan Africa. Their large ears not only assist with hearing prey and threats, but serve to regulate their body temperature.

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BIR064-00172

Two black-faced quailfinch (Ortygospiza atricollis) at the Zoo Berlin. The male is darker, with a brighter beak.

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BIR064-00171

Two black-faced quailfinch (Ortygospiza atricollis) at the Zoo Berlin. The male is darker, with a brighter beak.

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BIR062-00017

Two Brazilian tanagers (Ramphocelus bresilius) at the Zoo Berlin. The male is red. The female is brown.

Picture of formosan subterranean termites (Coptotermes formosanus) at the Audubon Insectarium in New Orleans.

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INS014-00114

Formosan subterranean termites (Coptotermes formosanus) at the Audubon Insectarium in New Orleans.

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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BIR052-00006

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.

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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BIR045-00048

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.

Picture of a pair of lesser whistling ducks (Dendrocygna javanica) at the Columbus Zoo.

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BIR032-00308

A pair of lesser whistling ducks (Dendrocygna javanica) at the Columbus Zoo.

Juvenile Stolzmann's horned frogs, Ceratophrys stolzmanni. This species is listed as vulnerable.

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ANI078-00231

Juvenile Stolzmann’s horned frogs, Ceratophrys stolzmanni. This species is listed as vulnerable.

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BIR045-00109

A pair of elegant quails (Callipepla douglasii) at a private facility. The male has an orange crest.

A pair of juvenile Yosemite toads (Bufo or Anaxyrus canorus) at the Museum of Vertebrate Zoology at U.C. Berkeley. (IUCN: EN)

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ANI076-00021

A pair of juvenile Yosemite toads (Bufo or Anaxyrus canorus) at the Museum of Vertebrate Zoology at U.C. Berkeley. (IUCN: EN)

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INV002-00404

San Diego fairy shrimp (Branchinecta sandiegonensis) at Kansas University. The female, above, is carrying eggs.
Listed as federally endangered in the US.