Remi Masson / Eurasian beaver (Castor fiber) carrying branches back to lodge, dropping them when alarmed. River Rhone, Rhone-Alpes, France, June.

Ingo Arndt / European Beaver (Castor fiber) parent with newborn young inside lodge, Germany

Ingo Arndt / European Beaver (Castor fiber) grooming newborn baby inside lodge, Germany

Ingo Arndt / European Beaver (Castor fiber) with two newborn babies inside lodge, Germany

Ingo Arndt / European Beaver (Castor fiber) playing with two newborn babies inside lodge, Germany

Thomas Lazar / American beaver lodge in lake {Castor canadensis} Michigan, USA

Konrad Wothe / American Beaver (Castor canadensis) swimming towards camera with lodge in background, North America

Gerry Ellis / American Beaver (Castor canadensis) dam, Silver Horn Creek, Lake Silver Horn, Wood River, Wood-Tikchik State Park, Alaska

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

Remi Masson / European beaver (Castor fiber) swimming under submerged branches outside of its lodge, knocks into camera, River Rhone, Rhone-Alpes, France, July.

Remi Masson / European beaver (Castor fiber) returning to its lodge, River Rhone, Rhone-Alpes, France, June.

Remi Masson / European beaver (Castor fiber) entering lodge, River Rhone, Rhone-Alpes, France, June.