Mother elephant and calf in woodland in Moremi National Park, Botswana

White willow (Salix alba) tree with base of trunk almost chewed through by Eurasian beaver (Castor fiber), Narew marshes, Podlaskie, Poland. MORE INFO: Beaver activity is crucial in keeping Poland's ancient marshes open and free of encroaching bushes and trees and their dams also help to maintain high water levels.

PERU General Man walking through a field of coca. Coca is still traditionally chewed by the Andean Indians but is also the base of cocaine.

Close up of chewed bubble gum stuck on The Gum Wall in Pike Place market in Seattle.