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.)

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...

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...

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.)

Nick Garbutt / RF - Malachite sunbird (Nectarinia famosa) male feeding on Aloe flower. Ndutu area, Ngorongoro Conservation Area NCA / Serengeti National Park. April. (This image may be licensed either as rights man...

Lynn M Stone / RF - Domestic Labrador retriever on rocky seashore. Madison, Connecticut, USA. December. (This image may be licensed either as rights managed or royalty free.)

Lynn M Stone / RF - American oystercatcher (Haematopus palliatus) probing sand for invertebrates at low tide. Tampa Bay, St. Petersburg, Florida, USA. March. (This image may be licensed either as rights managed or r...

Lynn M Stone / RF - Domestic Yellow labrador retriever in snow. Clinton, Connecticut, USA. January. (This image may be licensed either as rights managed or royalty free.)

Lynn M Stone / RF - Domestic Yellow labrador retriever in fresh snow. Clinton, Connecticut, USA. January. (This image may be licensed either as rights managed or royalty free.)

Ann & Steve Toon / RF - Head portrait of Spotted eagle owl (Bubo africanus), Kgalagadi Transfrontier Park, Northern Cape, South Africa, February 2016. (This image may be licensed either as rights managed or royalty free...

Ann & Steve Toon / RF - Young Yellow mongoose (Cynictis penicillata) investigating giant African millipede (Archispirostreptus gigas), Kgalagadi Transfrontier Park, Northern Cape, South Africa, January. (This image may...

David Tipling / RF - King penguin (Aptenodytes patagonicus) head portrait. Salisbury Plain, South Georgia. January. (This image may be licensed either as rights managed or royalty free.)