Nick Garbutt / RF - Mantled howler monkey (Alouatta palliata) resting on branch in rainforest canopy, Osa Peninsula, Costa Rica. (This image may be licensed either as rights managed or royalty free.)

Nick Garbutt / RF - Jaguar (Panthera onca) male, sitting on branch of a tree, Three Brothers River system, Porto Jofre, Pantanal, Brazil. (This image may be licensed either as rights managed or royalty free.)

Nick Garbutt / RF - Blue-and-yellow macaw (Ara ararauna) face detail, northern Pantanal, Mato Grosso, Brazil. (This image may be licensed either as rights managed or royalty free.)

Nick Garbutt / Guanaco (Lama guanicoe) standing in snow on the shore of Lago Pehoe, Torres del Paine National Park, Patagonia, Chile.

Nick Garbutt / Austral pygmy owl (Glaucidium nana) perched on snow covered tree stump, Torres del Paine National Park, Patagonia, Chile.

Nick Garbutt / Austral pygmy owl (Glaucidium nana) perched on snow covered tree stump, Torres del Paine National Park, Patagonia, Chile.

Nick Garbutt / Sunda frogmouth (Batrachostomus cornutus) rufous morph, perched on branch in dense river-side vegetation, Lower Kinabatangan River, Sabah, Borneo.

Nick Garbutt / Central American spider monkey (Ateles geoffroyi) female with infant feeding on palm fruits, Osa Peninsula, Costa Rica. Endangered.

Nick Garbutt / White-nosed coati (Nasua narica) resting on branch in forest understory, lowland rainforest, Osa Peninsula, Costa Rica.

Nick Garbutt / Strawberry poison dart frog (Oophaga pumilio) blue jeans morph, resting on forest floor, Boca Tapada, Atlantic slope, Costa Rica.

Richard Du Toit / Scrub hare (Lepus saxatilis) head portrait, Karoo National Park, Western Cape Province, South Africa.

Richard Du Toit / Amethyst sunbirds (Chalcomitra amethystina), Cape white-eye (Zosterops capensis) and Greater doublecollared sunbird (Nectarinia afra) on garden bird feeder, Garden Route, Western Cape Province, South...

Joel Sartore / Photo Ark / Spotted salamander (Ambystoma maculatum) portrait, Tennessee Aquarium, Chattanooga, Tennessee, USA. Captive.

Joel Sartore / Photo Ark / Spotted salamander (Ambystoma maculatum) portrait, Zoo Atlanta, Georgia, USA. Captive.

Roman Willi / RF - Western treesnake (Imantodes inornatus) hanging from branch at night, Limon, Costa Rica. (This image may be licensed either as rights managed or royalty free.)

Roman Willi / Blunt-headed treesnake (Imantodes cenchoa) hanging from tree at night, Osa Peninsula, Costa Rica.

Roman Willi / Common woodlouse (Onisculus asselus) portrait, Lucerne, Switzerland. October. Focus stacked image.

Roman Willi / Ichneumonidae wasp (Enicospilus sp.) portrait, Tinamaste, Costa Rica. Focus stacked image.

Roman Willi / Carabid beetle (Carabus problematicus) portrait, Lucerne, Switzerland. September.

Roman Willi / Longhorn beetle (Coccoderus timbaraba) portrait, Tinamaste, Costa Rica. Focus stacked image.

Roman Willi / Shield bug (Graphosoma italicum) resting on a flower, Lucerne, Switzerland. September.

Roman Willi / Whipspider (Paraphrynus laevifrons) portrait, Osa Peninsula, Costa Rica. Focus stacked image.

Roman Willi / Goldenrod crabspider (Misumena vatia) resting on underside of leaf, Lucerne, Switzerland. September. Focus stacked image.

Roman Willi / Jumping spider (Heliophanus sp.) resting on leaf with insect prey, Lucerne, Switzerland. April. Focus stacked image.

Roman Willi / Orbweaver spider (Epeiroides bahiensis) portrait, Osa Peninsula, Costa Rica. Focus stacked image.

Roman Willi / RF - Jumping spider (Euophrys frontalis) female, portrait, Lucerne, Switzerland. May. Focus stacked image. (This image may be licensed either as rights managed or royalty free.)

Roman Willi / Wall crab spider (Selenops sp.) male, portrait, Osa Peninsula, Costa Rica. Focus stacked image.

Roman Willi / RF - Jumping spider (Xanthofreya bicuspidata) female, portrait, Osa Peninsula, Costa Rica. Focus stacked image. (This image may be licensed either as rights managed or royalty free.)

Roman Willi / Jumping spider (Phiale sp.) female, resting on leaf mimicking a Velvet ant, Tinamaste, Costa Rica.

Roman Willi / Senoculid spider (Senoculus sp.) portrait, Tinamaste, Costa Rica. Focus stacked image.

Roman Willi / RF - Huntsman spider (Olios sp.) resting on leaves, Osa Peninsula, Costa Rica. Focus stacked image. (This image may be licensed either as rights managed or royalty free.)

Roman Willi / Jumping spider (Marpissa muscosa) female, preparing to jump, Lucerne, Switzerland. May.

Roman Willi / Jumping spider (Sidusa unicolor) male, portrait, Osa Peninsula, Costa Rica.

Roman Willi / Tree frog (Smilisca sp.) male, sitting in shallow water, calling, Osa Peninsula, Costa Rica.

Roman Willi / Common grassfrogs (Rana temporaria) pair in amplexus, Lucerne, Switzerland. March.

Roman Willi / Lemur leaf frog (Agalychnis lemur) portrait, Limon, Costa Rica. Focus stacked image.

Roman Willi / Boulenger's snouted tree frog (Scinax boulengeri) portrait, Osa Peninsula, Costa Rica. Focus stacked image.

Roman Willi / Lemur leaf frog (Agalychnis lemur) resting on a leaf, Limon, Costa Rica. Focus stacked image.

Lochman Agency / Northern snake-necked turtle (Chelodina oblonga) swimming underwater, Darwin region, Northern Territory, Australia.

Jiri Lochman / Northern red-faced turtle (Emydura australis) yellow-faced form, portrait, Mitchell River National Park, Western Australia.

Joel Sartore / Photo Ark / Western brush rabbit (Sylvilagus bachmani cinerascens) juvenile, portrait, Santa Barbara Wildlife Care Network, California, USA. Captive.

Joel Sartore / Photo Ark / Fat-tailed dwarf lemur (Cheirogaleus medius) portrait, Plzen Zoo, Czech Republic. Captive, occurs in Madagascar.

Joel Sartore / Photo Ark / Northern white-cheeked gibbon (Nomascus leucogenys) juvenile, portrait, Omaha's Henry Doorly Zoo and Aquarium, Nebraska. Captive, occurs in Southeast Asia. Critically endangered.

Joel Sartore / Photo Ark / Southern yellow cheeked gibbon (Nomascus gabriellae) male, head portrait, Singapore Zoo. Captive, occurs in Southeast Asia. Endangered.

Joel Sartore / Photo Ark / Von der Decken's sifaka (Propithecus deckenii) sitting, portrait, Lemuria Land, Madagascar. Captive. Critically endangered.

Joel Sartore / Photo Ark / Von der Decken's sifaka (Propithecus deckenii) head portrait, Lemuria Land, Madagascar. Captive. Critically endangered.

Joel Sartore / Photo Ark / Coquerel's sifaka (Propithecus coquereli) close up of face, Lemuria Land, Madagascar. Captive. Critically endangered.

Joel Sartore / Photo Ark / Von der Decken's sifaka (Propithecus deckenii) sitting, portrait, Lemuria Land, Madagascar. Captive. Critically endangered.

Joel Sartore / Photo Ark / Red ruffed lemur (Varecia rubra) head portrait with tongue poking out, Plzen Zoo, Czech Republic. Captive, occurs in Madagascar. Critically endangered.

Joel Sartore / Photo Ark / Crowned lemur (Eulemur coronatus) female, head portrait, Cleveland Metroparks Zoo, Ohio. Captive, occurs in Madagascar. Endangered.

Joel Sartore / Photo Ark / Coquerel's sifaka (Propithecus coquereli) portrait, Houston Zoo, Texas. Captive, occurs in Madagascar. Critically endangered.

Joel Sartore / Photo Ark / Eastern lesser bamboo lemur (Hapalemur griseus griseus) head portrait, Duke Lemur Center, North Carolina. Captive, occurs in Madagascar.

Joel Sartore / Photo Ark / Ethiopian hedgehog (Paraechinus aethiopicus) female, portrait, Arabia's Wildlife Centre, Sharjah, United Arab Emirates. Captive.

Joel Sartore / Photo Ark / Ethiopian hedgehog (Paraechinus aethiopicus) female, portrait, Arabia's Wildlife Centre, Sharjah, United Arab Emirates. Captive.

Joel Sartore / Photo Ark / Hoffmann's two-toed sloth (Choloepus hoffmanni pallescens) portrait, Centro de Rescate Amazonico, Iquitos, Peru. Captive.

Joel Sartore / Photo Ark / Isthmian raccoon (Procyon lotor pumilus) female, portrait, Rescue Center Costa Rica, Guacima, Costa Rica. Captive.

Joel Sartore / Photo Ark / Texas raccoon (Procyon lotor fuscipes) male, portrait, Alexandria Zoological Park, Louisiana, USA. Captive.

Joel Sartore / Photo Ark / Crab-eating raccoon (Procyon cancrivorus panamensis) portrait, Parque de las Leyendas, Peru. Captive.

Joel Sartore / Photo Ark / Eastern mole (Scalopus aquaticus machrinoides) portrait, Nebraska Wildlife Rehab, Omaha, Nebraska, USA. Captive.

Joel Sartore / Photo Ark / Seychelles black mud turtle (Pelusios subniger parietalis) male, portrait, Turtle Island, Austria. Captive, occurs in Seychelles.

Marie Read / Pacific loon (Gavia pacifica) in breeding plumage, on water with reflection, Anchorage, Alaska, USA. May.

Marie Read / Northern parula (Parula americana) male in breeding plumage, singing while perched on flowering Eastern redbud (Cercis canadensis) in spring, Ohio, USA. April.

Marie Read / Pribilof Islands arctic fox (Vulpes lagopus pribilofensis) blue morph cub, licking its lips while feeding on dead seabird, St. Paul, Pribilof Islands, Alaska, USA. August.

Marie Read / Pribilof Islands arctic fox (Vulpes lagopus pribilofensis) blue morph cub, feeding on dead Murre (Uria sp.), St. Paul, Pribilof Islands, Alaska, USA. July.

Andy Rouse / RF - Iberian lynx (Lynx pardinus) male, portrait, Andalusia, Spain. October. Endangered. (This image may be licensed either as rights managed or royalty free.)

Andy Rouse / Iberian lynx (Lynx pardinus) male, portrait, Andalusia, Spain. October. Endangered.

Andy Rouse / Iberian lynx (Lynx pardinus) male, sitting on rocks looking back, Andalusia, Spain. October. Endangered.

Andy Rouse / Iberian lynx (Lynx pardinus) male, sitting on rocks, Andalusia, Spain. October. Endangered.

Andy Rouse / Iberian lynx (Lynx pardinus) male, walking over rocky ground, Andalusia, Spain. October. Endangered.

Emmanuel Rondeau / Fox (Vulpes vulpes) standing at entrance to a wildlife underpass below the A89 highway at night, Rhone, Correze, France. June. Camera trap image.

Emmanuel Rondeau / Roe deer (Capreolus capreolus) male, standing on a wildlife crossing above the busy A7 highway, Drome, France. September. Camera trap image.

Joel Sartore / Photo Ark / Blue land crab (Cardisoma guanhumi) portrait, near Vero Beach, Florida, USA.

Joel Sartore / Photo Ark / Three-striped roofed turtle (Batagur dhongoka) female, portrait, Turtle Island, Austria. Captive, occurs in South Asia. Critically endangered.

Doug Perrine / Bigeye emperor (Monotaxis grandoculis) portrait, Honokohau, North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Schooling Bigeye emperors (Monotaxis grandoculis), Honokohau, North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Bigeye emperor (Monotaxis grandoculis) sub-adult, portrait, Honokohau, Kona, Hawaii, Pacific Ocean.

Loic Poidevin / Red deer (Cervus elaphus) female and fawn in woodland, Yonne, Bourgogne-Franche-Comte, France. September.

Loic Poidevin / European mouflon (Ovis aries musimon) herd in woodland, Parc de la Haute Touche, Obterre, Indre, France. September.

Pal Hermansen / Lion (Panthera leo) portrait, Masai Mara, Kenya.

Pal Hermansen / Large marsh grasshopper (Stethophyma grossum) jumping in wet meadow, Viken, Norway. August.

Pal Hermansen / Apollo butterfly (Parnassius apollo) wing detail, Telemark, Norway. June.

Pal Hermansen / Apollo butterfly (Parnassius apollo) nectaring on flower, Telemark Norway. June.

Pal Hermansen / Cuckoo bumblebee (Bombus boehmicus) coated with pollen resting on Dandelion (Taraxacum officinale) flower in spring, Ski, Norway. May.

Lucas Bustamante / Tawny-bellied screech owl (Megascops watsonii) perched at entrance to nest hole in tree cavity, Yasuni National Park, Orellana, Ecuador.

Lucas Bustamante / Spectacled bear (Tremarctos ornatus) looking down from tree in cloud forest of the Ecuadorian Choco, Pichincha, Ecuador.

Lucas Bustamante / Spectacled bear (Tremarctos ornatus) resting in tree, looking down, in the cloud forest of the Ecuadorian Choco, Pichincha, Ecuador.

Lucas Bustamante / RF - Spectacled bear (Tremarctos ornatus) resting in tree, looking down in the cloud forest of the Ecuadorian Choco, Pichincha, Ecuador. (This image may be licensed either as rights managed or royalty...

Andy Sands / Horse fly (Tabanus autumnalis) portrait, close up showing compound eyes, Hertfordshire, England, UK. June. Focus stacked.

Andy Sands / Horned leafhopper (Ledra aurita) portrait, Hertfordshire, England, UK. July. Focus stacked.

Robin Chittenden / Little owl (Athene noctua) perched on branch, Norfolk, England, UK. June.

Robin Chittenden / Reed warbler (Acrocephalus scirpaceus) perched among reeds, Norfolk, England, UK. June.

Andy Sands / Banded demoiselle (Calopteryx splendens) covered in dew, portrait, Hertfordshire, England, UK. July. Focus stacked.

Robin Chittenden / Chinese water deer (Hydropotes inermis) feeding in long grass, Norfolk, England, UK. June.

Robin Chittenden / European hedgehog (Erinaceus europaeus) hiding underneath a car, Norwich, Norfolk, UK. May.

Robin Chittenden / Roe deer (Capreolus capreolus) buck, standing in long grass, head portrait, Norfolk, England, UK. May.

Robin Chittenden / Fox (Vulpes vulpes) walking through long grass, Suffolk, England, UK. May.