Michael Quinton / American Beaver (Castor canadensis) nibbling on leaf from willow branch in boreal pond, Alaska

Shin Yoshino / American Beaver (Castor canadensis) swimming with tree branch, North America

Michio Hoshino / American Beaver (Castor canadensis) carrying cut branches used to build its lodge, Alaska

Jim Brandenburg / American Beaver (Castor canadensis) cutting branch, Minnesota

Oscar Dewhurst / North American beaver (Castor canadensis) swimming with head above water. Stanley Park, Vancouver, British Columbia, Canada. August.

Oscar Dewhurst / North American beaver (Castor canadensis) swimming with head above water. Stanley Park, Vancouver, British Columbia, Canada. August.

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

Suzi Eszterhas / Children, supporters of Martinez Beavers, making beaver crafts. Martinez, California. September 2015. Model released.

Suzi Eszterhas / North American beaver (Castor canadensis) kit eating Willow (Salix sp). Martinez, California, USA. July.

Suzi Eszterhas / North American beaver (Castor canadensis) swimming with head above water. Martinez, California, USA. July.

Suzi Eszterhas / North American beaver (Castor canadensis) kit playing with Willow (Salix sp) at water's edge. Martinez, California, USA. June.

Suzi Eszterhas / North American beaver (Castor canadensis) eating Willow (Salix sp). Martinez, California, USA. June.