David Noton / Canoes on the moored on the Nam Song River at Vang Vieng, Laos, March 2009.

Chris & Monique Fallows / Sooty Albatros (Phoebetria fusca) at sea off South Georgia Island, Antarctica

Tim Fitzharris / Fallen autumn colored Aspen leaves on the ground covered in dew droplets, Colorado

Jen Guyton / Mopane snake (Hemirhagerrhis nototaenia), from the Greater Gorongosa Ecosystem, Mozambique. Here, the snake shows its defensive tail display -- the contrastingly colored orange tail is held up to dist...

Jen Guyton / Lichen-colored snail-sucker snake (Sibon longifrenis) from La Selva Biological Station, Costa Rica. Controlled conditions.

Sven Zacek / Sedge warbler (Acrocephalus schoenobaenus) singing in front of a foggy background colored golden by the rising sun, Valgamaa, Estonia, June.

David Noton / Weaver making silk cloth, Luang Prabang, Laos, March 2009.

MYN / Krista Schlyer / Fire-colored beetle (Pedilus sp.) harvesting toxic chemical from an American oil beetle (Meloe americanus), Anacostia watershed, Washington DC, USA, April. Meetyourneighbours.net project.

MYN / Krista Schlyer / Fire-colored beetle (Pedilus sp.) harvesting toxic chemical from an American oil beetle (Meloe americanus), Anacostia watershed, Washington DC, USA, April. Meetyourneighbours.net project.

Chien Lee / Blanford's Pipe Snake (Cylindrophis lineatus) raising its tail which is thickened and colored to appear as a head in a defense posture, Kuching, Sarawak, Malaysia

Andy Rouse / Mandarin Duck (Aix galericulata) male on lake, UK, April.

Michael D. Kern / Yellow Naped Amazon Parrot (Amazona auropalliata) feather against black background.

Michael D. Kern / Yellow Naped Amazon Parrot (Amazona auropalliata) feather against black background.

Michael D. Kern / Yellow Naped Amazon Parrot (Amazona auropalliata) wing feather against black background.

Peter Lewis / Blackbird (Turdus merula) singing high in a tree, Hampshire, England, UK. April.

Peter Lewis / Blackbird (Turdus merula) singing high in a tree, Hampshire, England, UK. April.

Peter Lewis / Blackbird (Turdus merula) singing high in a tree, Hampshire, England, UK. April.

Peter Lewis / Blackbird (Turdus merula) singing high in a tree, Fareham, Hampshire, England, UK. April.

Peter Lewis / Robin (Erithacus rubecula) singing in tree, Hampshire, England, UK. April.

Peter Lewis / Blackbird (Turdus merula) singing high in a tree, Fareham, Hampshire, England, UK. April.

John Cancalosi / Scoria, a highly vesicular, dark colored volcanic rock that may or may not contain crystals. From Hawaii.

Kim Taylor / St Mark's Fly (Bibio marci) male in flight. Surrey, England. May

Kim Taylor / St Mark's Fly (Bibio marci) male in flight. Surrey, England. May

Wild Wonders of Europe / Widstr / Egyptian vulture (Neophron percnopterus) in flight, Madzharovo, Eastern Rhodope Mountains, Bulgaria, May 2013, endangered species.

Wild Wonders of Europe / Widstr / Egyptian vulture (Neophron percnopterus) in flight, Madzharovo, Eastern Rhodope Mountains, Bulgaria, May 2013, endangered species.

Cheryl-Samantha Owen / Cape gannet (Morus capensis) covered in oil, during rehabilitation at the Southern African Foundation for the Conservation of Coastal Birds (SANCCOB) South Africa, November 2011

Cheryl-Samantha Owen / Cape gannet (Morus capensis) covered in oil, during rehabilitation at the Southern African Foundation for the Conservation of Coastal Birds (SANCCOB) South Africa, November 2011

Cheryl-Samantha Owen / Cape gannet (Morus capensis) covered in oil, during rehabilitation at the Southern African Foundation for the Conservation of Coastal Birds (SANCCOB) South Africa, November 2011

Nick Upton / Kestrel (Falco tinnunculus) in flight overhead, Cornwall, UK, April.

Floris van Breugel / Yellow tent illuminated in the waning twilight hours on the shores of frozen Garibaldi Lake with a view of Mount Price in the background. Garibaldi Provincial Park. Britisth Columbia, Canada, March 20...

Theo Bosboom / Wood cranesbill (Geranium sylvaticum) flower against white background, Asbyrgi, Iceland, June

Theo Bosboom / Wood cranesbill (Geranium sylvaticum) flower against white background, Asbyrgi, Iceland, June

Solvin Zankl / GEOMAR / Northern Krill (Meganyctiphanes norvegica) The stomach is colored intensly red from carotenoids, an indication that this euphausid feeds on copepods. Trondheimfjord, North Atlantic Ocean, Norway. Cont...

Michio Hoshino / Autumn colored forest, Alaska

Michio Hoshino / Autumn colored tundra, Denali National Park and Preserve, Alaska

Tim Fitzharris / Detail of rainbow-colored bubbles, California

Jasper Doest / Fall colored tree, Vlaardingen, Netherlands

Joel Sartore / Photo Ark / Slate-colored grosbeak (Saltator grossus) portrait, Walsrode Bird Park, Germany. Captive, occurs in Central and South America.

Joel Sartore / Photo Ark / Two Gray sand stars, showing varying color morphs. (Luidia lawrencei) the larger, solid colored starfish on the left and (Luidia clatherata) the smaller starfish with lines, on white background, Gulf...

Joel Sartore / Photo Ark / Two Gray sand stars, showing varying color morphs. (Luidia lawrencei) the larger, solid colored starfish on the left and (Luidia clatherata) the smaller starfish with lines, on black background, Gulf...

Joel Sartore / Photo Ark / Many-colored fruit dove (Ptilinopus perousii) male profile, Toledo Zoo. Captive.

Joel Sartore / Photo Ark / Parti-colored bat (Vespertilio murinus) crawling and calling at Moscow Zoo, Russia. Captivity.

Joel Sartore / Photo Ark / Close up of Straw-colored fruit bat (Eidolon helvum) face, hanging upside down, at Tulsa Zoo, USA. Captivity.

Joel Sartore / Photo Ark / Close of Straw-colored fruit bat (Eidolon helvum) face, hanging upside down, at Tulsa Zoo, USA. Captivity.

Joel Sartore / Photo Ark / Close up of Straw-colored fruit bat (Eidolon helvum) face at Tulsa Zoo, USA. Captivity.

Joel Sartore / Photo Ark / Close up of Straw-colored fruit bat (Eidolon helvum), hanging upside down, at Tulsa Zoo, USA. Captivity.

Joel Sartore / Photo Ark / Close up of Straw-colored fruit bat (Eidolon helvum) face, hanging upside down, at Tulsa Zoo, USA. Captivity.

Georgette Douwma / Blue tropical reef fish composite image on black background, Blue triggerfish (Pseudobalistes fuscus), Bicolour angelfish (Centropyge bicolor), Elongate surgeonfish (Acanthurus mata), Yellowtail tang...

Jack Dykinga / Autumn-colored cottonwood trees (Populus sp.) in flooded ponds, with Sandhill cranes (Grus canadensis) and Snow geese (Chen caerulescens) in background, at dawn.Cibola National Wildlife Refuge, Arizon...

Guy Edwardes / Chestnut-colored woodpecker (Celeus castaneus) on tree trunk, Lowland rainforest, Costa Rica.