Alex Hyde / RF - Scarlet macaw (Ara macao) pair preening, Osa Peninsula, Costa Rica. (This image may be licensed either as rights managed or royalty free.)

Alex Hyde / RF - Close up of feathers of a Scarlet Macaw (Ara macao) Osa Peninsula, Costa Rica. (This image may be licensed either as rights managed or royalty free.)

Staffan Widstrand / RF- Walrus (Odobenus rosmaris) close up head portrait, Svalbard, Norway. (This image may be licensed either as rights managed or royalty free.)

Rolf Nussbaumer / RF- Western Diamondback Rattlesnake (Crotalus atrox), adult in striking pose with rattle raised, in wildflowers. Laredo, Webb County, South Texas, USA. April. (This image may be licensed either as rig...

Edwin Giesbers / RF- Whooper Swan (Cygnus cygnus) in profile, calling. The Netherlands. June. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Grey Heron (Ardea cinerea) taking off from reeds. The Netherlands. June. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Konik Wild Horse (Equus ferus caballus) low angle close up of head. The Netherlands. July. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Jaguar (Panthera onca) head portrait, captive. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- African Lion (Panthera leo) head portrait of male roaring, captive. (This image may be licensed either as rights managed or royalty free.)

Ross Hoddinott / RF- Robin (Erithacus rubecula) portrait in snow. Near Bradworthy, Devon, UK. January. (This image may be licensed either as rights managed or royalty free.)

Rolf Nussbaumer / RF- Northern Raccoon (Procyon lotor) drinking from wetland lake. Fennessey Ranch, Refugio, Coastal Bend, Texas Coast, USA. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Giant panda (Ailuropoda melanoleuca) feeding on bamboo in snow. Captive born in 2000, occurs in China. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Northern gannet (Morus bassanus) pair, Heligoland, Germany. April. (This image may be licensed either as rights managed or royalty free.)

Wild Wonders of Europe / Widstrand / RF- Eurasian brown bear (Ursus arctos) running, Suomussalmi, Finland. July. (This image may be licensed either as rights managed or royalty free.)

Wild Wonders of Europe / Widstrand / RF- Eurasian brown bear (Ursus arctos) close-up of face, Suomussalmi, Finland. July. (This image may be licensed either as rights managed or royalty free.)

Wild Wonders of Europe / Widstrand / RF- Eurasian brown bear (Ursus arctos) mother walking with cub, Suomussalmi, Finland. July. (This image may be licensed either as rights managed or royalty free.)

Doug Perrine / RF- Atlantic sailfish (Istiophorus albicans) attacking bait ball of Spanish sardines (Sardinella aurita) near Yucatan Peninsula, Mexico, Caribbean Sea. (This image may be licensed either as rights man...

Ross Hoddinott / RF- Wild garlic / Ramsons (Allium ursinum) and fern, Coombe Valley, Cornwall, UK. May. (This image may be licensed either as rights managed or royalty free.)

Ross Hoddinott / RF- Sunset on Kimmeridge Bay, Isle of Purbeck, Jurassic Coast World Heritage Site, Dorset, England, UK. November 2008. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Gentoo Penguin (Pygoscelis papua) chick begging parent for food, Antarctica. (This image may be licensed either as rights managed or royalty free.)

Rolf Nussbaumer / RF- Sword-billed Hummingbird (Ensifera ensifera) female feeding from Passion flower (Passiflora mixta). Papallacta, Ecuador, Andes, South America. January. (This image may be licensed either as rights...

Edwin Giesbers / RF- Red eyed tree frog (Agalychnis callidryas) on heliconia plant, Costa Rica. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Red Deer (Cervus elaphus) stag and three does silhouette grazing. Dyrehaven, Denmark. (This image may be licensed either as rights managed or royalty free.)

Doug Perrine / RF- Green sea turtle (Chelonia mydas) being cleaned by herbivorous cleaner fish species Yellow tangs (Zebrasoma flavescens) and Gold-ring surgeonfish (Ctenochaetus strigosus) that graze algae on turtl...

Ross Hoddinott / RF- Beech (Fagus) and Bluebell (Hyacinthoides non-scripta) woodland at Lanhydrock, Cornwall. UK. (This image may be licensed either as rights managed or royalty free.)

Ross Hoddinott / RF- Bluebell (Endymion / Hyacinthoides non-scripta), Cornwall. UK. (This image may be licensed either as rights managed or royalty free.)

Rolf Nussbaumer / RF- Vermilion Flycatcher (Pyrocephalus rubinus) male giving insect to female for young in nest. Lake Corpus Christi, Texas, USA. May. (This image may be licensed either as rights managed or royalty fr...

Rolf Nussbaumer / RF- Green treefrog (Hyla cinerea) on yellow waterlily. Welder Wildlife Refuge, Sinton, Texas, USA. (This image may be licensed either as rights managed or royalty free.)

Rolf Nussbaumer / RF- Bullfrog (Rana catesbeiana) adult on American lotus lilypad. Welder Wildlife Refuge, Sinton, Texas, USA. (This image may be licensed either as rights managed or royalty free.)

Ross Hoddinott / RF- Common frog (Rana temporaria). Cornwall, UK. (This image may be licensed either as rights managed or royalty free.)

Ross Hoddinott / RF- Bee orchid (Ophrys apifera). Cornwall, UK. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Grey Andalusian mare running in snow, Berthoud, Colorado, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Head portrait of grey Andalusian mare with long mane in snow, Berthoud, Colorado, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Wild Mustang mare with sister and foal at Black Hills Wild Horse Sanctuary, South Dakota, USA. May. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Wild black Mustang filly leaping as pinto Mustang mother and friend follow, Black Hills Wild Horse Sanctuary, South Dakota, USA. June. (This image may be licensed either as rights managed or roy...

Carol Walker / RF - Head portrait of wild Mustang stallion tossing his mane while running, Black Hills Wild Horse Sanctuary, South Dakota, USA. February. (This image may be licensed either as rights managed or royal...

Carol Walker / RF - Bobcat (Lynx rufus) pausing on snowy river bank, Yellowstone, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Bobcat (Lynx rufus) jumping in winter snow, Yellowstone, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Bobcat (Lynx rufus) pausing in winter snow, Yellowstone, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Coyote (Canis latrans) walking though deep winter snow, Yellowstone, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Coyote (Canis latrans) walking in winter snow, Yellowstone, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Head portrait of Red fox (Vulpes vulpes) licking lips in winter snow, Yellowstone, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Bison (Bison bison) walking in winter snow, Yellowstone, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Close up of Bison (Bison bison) walking in winter snow, Yellowstone, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Bison (Bison bison) standing in winter, covered in snow, Yellowstone, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Four Bison (Bison bison) walking in a line through winter snow, Yellowstone, USA. January. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Wild buckskin Mustang stallion walking towards waterhole on dusty dry summer day, Sand Wash Basin, Colorado, USA. August. (This image may be licensed either as rights managed or royalty free.)

Carol Walker / RF - Wild faded pinto Mustang stallion leaping through air in pursuit of another stallion, Sand Wash Basin, Colorado, USA. June. (This image may be licensed either as rights managed or royalty free.)