Yva Momatiuk & John Eastcott / American Beaver (Castor canadensis) a semi-aquatic rodent swimming across calm pond behind beaver dam on mountain river, fall foliage reflectd in water, evening, Denali National Park, Alaska

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

George Sanker / Coniferous forest and mountains reflected in beaver pond at sunrise. Grand Teton National Park, Wyoming, USA. June 2018.

Michel Roggo / North American beaver (Castor canadensis) lodge, and mountain landscape. Muskwa-Kechika Protected Area, Northern Rockies, British Columbia, Canada. July 20111. Photographed for The Freshwater Project

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

Tim Fitzharris / Avery Peak reflected in beaver pond, San Juan Mountains, Colorado

Ingo Arndt / European Beaver (Castor fiber) dam, Bieszczady, Poland

Tim Fitzharris / Beavertail Cactus (Opuntia basilaris) with Picacho Mountain in the background, Pichaco Peak State Park, Arizona

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

Tim Fitzharris / Haystack Mountain reflected in beaver pond, Maroon Bells, Snowmass Wilderness, Colorado

Tim Edwards / Beaver Lake surrounded by coniferous forest, Jasper NP, Alberta, Canada

Michael Durham / Mountain Beaver (Aplodontia rufa) at night, not truly a Beaver but a Muskrat-like rodent, Mt Hood National Forest, Oregon

Michael Durham / Mountain Beaver (Aplodontia rufa) at night, not truly a Beaver but a Muskrat-like rodent, Mt Hood National Forest, Oregon

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

Tim Fitzharris / Gothic Mountain and Beaver Lodge, near Crested Butte, Colorado

Tim Fitzharris / Beaver pond along the Slate River near Crested Butte, Colorado

Tim Fitzharris / Boulder Mountains reflected in beaver pond, Idaho

Tim Fitzharris / Avery Peak reflected in beaver pond, San Juan Mountains, Colorado

Tim Fitzharris / Handies Peak reflected in beaver pond, Maroon Bells-Snowmass Wilderness Area, Colorado

Patricio Robles Gil / Beavertail Cactus (Opuntia basilaris) and peaks in the Maderas del Carmen range, Chihuahuan Desert, Mexico

Pete Oxford / American Beaver (Castor canadensis) pond with dam and lodge, Grand Teton National Park, Wyoming

Pete Oxford / American Beaver (Castor canadensis) pond with dam and lodge, Grand Teton National Park, Wyoming

Konrad Wothe / American Beaver (Castor canadensis) cuttings on tree, Ural Mountains, Pechora-Ilych Reserve, Komi, Russia

Doug Allan / Beaver (Myocastor coypus) dam in summer with lake built up behind, Ushuaia, Beagle Channel, Tierra del Fuego, Argentina.

Joel Sartore / Photo Ark / Mountain beaver (Aplodontia rufa pacifica) male eating a fern leaf, Wildlife Center of the North Coast. Captive.

Kirkendall-Spring / Cholla cactus and Joshua tree in Beaver Dam Wash a National Conservation Area and scenic backway in the Mojave Desert. Utah, USA. March.

George Sanker / American Red squirrel (Tamiasciurus hudsonicus) on tree trunk drinking in a beaver pond. Acadia National Park, Maine, USA.

George Sanker / American red squirrel (Tamiasciurus hudsonicus) on tree trunk drinking in a beaver pond early in the morning. Acadia National Park, Maine, USA. May.

George Sanker / American red squirrel (Tamiasciurus hudsonicus) drinking in a beaver pond early in the morning. Acadia National Park, Maine, USA.