Donald M. Jones / Eastern Fox Squirrel (Sciurus niger) hanging in tree, Great Falls, Montana

Rolf Nussbaumer / Eastern Fox Squirrel {Sciurus niger} in tree cavity, Hill Country, Texas, USA

Rolf Nussbaumer / Fox squirrel feeding {Sciurus niger} Texas, USA.

Rolf Nussbaumer / Fox squirrel, black form {Sciurus niger} Texas, USA.

Barry Mansell / Sherman's fox squirrel (Sciurus niger shermani) North Florida, USA, May.

Barry Mansell / Sherman's fox squirrel (Sciurus niger shermani) North Florida, USA, May.

John Cancalosi / Eastern fox squirrel, (Sciurus niger) in tree, New York, USA, September.

Steve Gettle / Eastern Fox Squirrel (Sciurus niger) collecting nesting material, Huron Meadows Metropark, Michigan

Suzi Eszterhas / Eastern Fox Squirrel (Sciurus niger) four week old orphaned young drinking milk, WildCare, San Rafael, California

Suzi Eszterhas / Eastern Fox Squirrel (Sciurus niger) three week old orphaned young drinking milk, WildCare, San Rafael, California

Steven David Miller / Western fox squirrel (Sciurus niger) on tree trunk gathering acorns, Custer State Park, South Dakota, USA. September 2013.

Steven David Miller / Western fox squirrel (Sciurus niger) on tree trunk gathering acorns, Custer State Park, South Dakota, USA. September 2013.