Edwin Giesbers / RF- Gentoo Penguin (Pygoscelis papua) chick huddled against parent's body for warmth, Antarctica. (This image may be licensed either as rights managed or royalty free.)

Nick Garbutt / Rhino rubbing stones, Skeleton Coast Park, Namibia. Historically Black Rhinos were found in the area (up to 1960s). Males used these stones to rub themselves against, hence the stones' polished look.

Pete Oxford / African Elephants (Loxodonta africana) rubbing their bodies against a termite mound. After covering themselves with mud in the waterhole they dustbath and sometimes rub against any available outcrop o...

Donald M. Jones / White-tailed Deer (Odocoileus virginianus) buck rub on tree, western Montana

Donald M. Jones / White-tailed Deer (Odocoileus virginianus) buck smelling rub on tree, western Montana

Donald M. Jones / Elk (Cervus elaphus) calf rubbing bull rub, nothern Rocky Mountains, Canada

Donald M. Jones / Elk (Cervus elaphus) antler scrape on Cottonwood (Populus sp) trunk, Jasper National Park, Alberta, Canada

Donald M. Jones / Elk (Cervus elaphus) antler scrape on Cottonwood (Populus sp) trunk, Jasper National Park, Alberta, Canada

Donald M. Jones / White-tailed Deer (Odocoileus virginianus) rub on tree from buck, western Montana

Donald M. Jones / American Elk (Cervus elaphus nelsoni) calf rubbing mature bulls' rub, western Montana

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) mature buck smelling fresh rub

Visuals Unlimited / Bison (Bison bison) rub marks, hair, and sap on a Lodgepole Pine (Pinus contorta), USA.

Donald M. Jones / White-tailed Deer (Odocoileus virginianus) rubbed trees by bucks, western Montana

Donald M. Jones / Coue's Deer (Odocoileus virginianus couesi) mature buck smelling rub, southern Arizona

Donald M. Jones / Elk (Cervus elaphus) calf smelling bull rub, nothern Rocky Mountains, Canada