Nick Hawkins / Underneath view of a North American beaver (Castor canadensis) swimming under the ice of a frozen river. Quebec, Canada. October.

Suzi Eszterhas / North American beaver (Castor canadensis) on dam. Martinez, California, USA. June.

George Sanker / North American beaver (Castor canadensis). swimming in late evening light, Acadia National Park, Maine, USA., September.

Claudio Contreras / American Beaver (Castor canadensis) splashing water with tail, Los Fresnos Ranch, Sonora, northwestern Mexico, February.

George Sanker / American beaver (Castor canadensis) swimming, Grand Teton NP, Wyoming, USA, October

Donald M. Jones / American Beaver (Castor canadensis) carrying branch over dam, western Montana

Donald M. Jones / American Beaver (Castor canadensis) swimming with willow branch in mouth, western Montana

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

JEFF FOOTT / American beaver (Castor canadensis) damage to tree, Teton NP Wyoming USA

JEFF FOOTT / American beaver (Castor canadensis) eating willow Grand Teton NP, Wyoming, USA

JEFF FOOTT / American Beaver eating willow (Castor canadensis) GRand Teton NP, Wyoming USA

Richard Du Toit / American beaver shaking off water (Castor canadensis) Grand Teton NP, USA