Scott Leslie / Beaver Dam Mountains from Beaver Dam Wash National Conservation Area, Utah

Enrique Lopez-Tapia / Peatland landscape in Tierra del Fuego with North American beaver (Castor canadensis) dam, an invasive species (introduced for fur trade). Argentina

Pete Oxford / American beaver (Castor canadensis) dam across a stream with a large conical house.Grand Teton National Park, Wyoming. USA

Tim Fitzharris / Beaver dam and pond surrounded by boreal forest with Mount Robson in background Mount Robson Provincial Park, British Columbia, Canada

Philippe Clement / American Beaver dam and den {Castor canadensis} Grand Teton NP, Wyoming, USA.

Philippe Clement / American Beaver dam {Castor canadensis} Grand Teton NP, Wyoming, USA.

David Kjaer / American beaver dam {Castor canadensis} Grand Teton NP, Wyoming, USA

Philippe Clement / Dam constructed by American beaver {Castor canadensis} Grand Teton National Park, Wyoming, USA

Sumio Harada / American Beaver (Castor canadensis) building dam, Rocky Mountains, North America

Sumio Harada / American Beaver (Castor canadensis) underwater view of dam, Rocky Mountains, North America