Beaver dam, Snake River at Schwabacher Landing, Grand Tetons National Park, Wyoming, United States of America, North America

Beaver (Castor canadensis) hauling a log up over its dam, Denali National Park and Preserve, Alaska, United States of America

Beaver Pond and Dam with Teton Range, Grand Tetons National Park, Wyoming, United States of America, North America

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.

Eurasian beaver (Castor fiber) dam on drainage channel in Narew marshes, Podlaskie, Poland. MORE INFO: Beaver activity benefits much other wetland wildlife by helping to maintain high water levels in Poland's ancient marshes and swamp forests.

Beaver dam and trees with feeding marks in sunshine, Fulda, Hesse, Germany, Europe

Grand Teton Range and beaver dam, Snake River, Grand Teton National Park, Wyoming, USA

Joshua tree (Yucca brevifolia) in the Beaver Dam Wash National Conservation Area, Mojave Desert, Utah, USA, North America

North American Beaver (Castor canadensis) building a dam in Denali National Park, Alaska, USA

European Beaver dam on a backwater of the river Ain, France