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

Terry Whittaker / Rodrigo A. Martinez Catalan, South Iceland Nature Research Centre, checking an Atlantic puffin (Fratercula arctica) burrow for occupancy using an infra-red camera attached to VR goggles, with research...

Terry Whittaker / Rodrigo A. Martinez Catalan, South Iceland Nature Research Centre, checking an Atlantic puffin (Fratercula arctica) burrow for occupancy using an infra-red camera attached to VR goggles, Akurey Island...

Fabio Pupin / Martinez-Rica's rock lizard,(Iberolacerta martinezricai), basking in habitat, Spain, October. Critically endangered species. Non-ex.

Fabio Pupin / Martinez-Rica's rock lizard, (Iberolacerta martinezricai), Spain, October . Non-ex.

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.

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

Claudio Contreras / Dr Juan Martinez from Mexico's INECOL in front of Barcena volcano slope, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage...

Suzi Eszterhas / American Beaver (Castor canadensis) being watched by children in urban environment, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) parent and eight-week-old kit on dam in urban creek, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) mother and eight-week-old kit feeding on Cottonwood (Populus sp), Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) mother and eight-week-old kit feeding on Cottonwood (Populus sp), Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on Willow (Salix sp) on dam in urban creek, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on Willow (Salix sp) branches, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) in urban creek with litter, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on Willow (Salix sp) branches, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) mother and eight-week-old kit feeding, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on Willow (Salix sp) branches, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on Willow (Salix sp) branches, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on riverbank, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) conservationist, Ethan Arnold, planting Willow (Salix sp) trees for beaver habitat, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) conservationist, April Ludlow, holding her beaver art, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) watched by people in urban environment, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) watched by children in urban environment, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) on dam, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) parent and eight-week-old kit, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) mother and eight-week old kit, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) mother and eight-week old kit feeding on Willow (Salix sp) branches, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on Cottonwood (Populus sp), Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) eight-week-old kit on dam, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) eight-week-old kits feeding on Cottonwood (Populus sp), Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) eight-week-old kits feeding on Cottonwood (Populus sp), Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) parent, two-year-old sub-adult and eight-week-old kit, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on Cottonwood (Populus sp), Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) eight-week-old kit, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on Willow (Salix sp) on dam in urban creek, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis), Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) eight-week-old kit feeding on Willow (Salix sp) branches, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) eight-week-old kit, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) mother and eight-week-old kit, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on Willow (Salix sp) branches, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on Willow (Salix sp) branches, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) feeding on Willow (Salix sp) branches, Martinez, California

Suzi Eszterhas / American Beaver (Castor canadensis) on dam in urban creek, Martinez, California