Denis-Huot / RF- Young Olive baboons (Papio hamadryas anubis) playing with one hanging from the others tail, Nakuru National Park, Kenya. (This image may be licensed either as rights managed or royalty free.)

Staffan Widstrand / RF- Abstract ice formation in shape of whale's tail, in coastal waters, Svalbard, Norway July 2011. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Male Wild turkey (Meleagris gallopavo) displaying, captive. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Male Indian peafowl (Pavo cristatus) displaying, captive. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Black Rat (Rattus rattus) feeding in domestic environment. Captive. The Netherlands. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Ring-tailed lemur (Lemur catta) with tail in the air silhouetted in light, Berenty Reserve, Madagascar, Africa. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Tail fluke of Humpback whale (Megaptera novaeangliae) diving, Antarctica. (This image may be licensed either as rights managed or royalty free.)

Doug Perrine / RF- Blue whale (Balaenoptera musculus). California, USA, Endangered. (This image may be licensed either as rights managed or royalty free.)