Daniel Heuclin / Great basin Gopher Snake / Bullsnake (Pituophis catenifer deserticola) head profile, controlled conditions, Joshua Tree National Monument, California USA

Shattil & Rozinski / Bullsnake {Pituophis catenifer sayi} ready to strike, Colorado, USA

Jack Dykinga / Gopher snake (Pituophis sp) amongst Lechuguilla (Agave lechuguilla) and prickly pear cacti (Opuntia macrocentra), Maderas del Carmen Natural Reserve, Mexico

Daniel Heuclin / Great basin Gopher Snake / Bullsnake (Pituophis catenifer deserticola) controlled conditions, Joshua Tree National Monument, California USA

Daniel Heuclin / Great basin Gopher Snake / Bullsnake (Pituophis catenifer deserticola) controlled conditions, Joshua Tree National Monument, California USA

Donald M. Jones / American Badger (Taxidea taxus) with Bullsnake (Pituophis melanoleucus) prey, National Bison Range, Moise, Montana

Pete Oxford / Black pine snake (Pituophis melanoleucus lodingi), endangered species, Southern USA, captive

Pete Oxford / Southern / Florida Pinesnake (Pituophis melanouecus mugitus) captive

Pete Oxford / Louisiana pinesnake (Pituophis ruthveni) captive

Charlie Summers / Bull Snake (Pituophis catenifer sayi) coiled in defensive position ready to strike. Colorado, USA, May.

Pete Oxford / Southern Pinesnake (Pituophis melanoleucus mugitus), native to the southeastern United States

Pete Oxford / Southern Pinesnake (Pituophis melanoleucus mugitus) in pine needles, native to the southeastern United States

Pete Oxford / Southern Pinesnake (Pituophis melanoleucus mugitus), native to the southeastern United States

Pete Oxford / Southern Pinesnake (Pituophis melanoleucus mugitus), native to the southeastern United States

Pete Oxford / Southern Pinesnake (Pituophis melanoleucus mugitus), native to the southeastern United States

Michael D. Kern / Pacific gopher snake (Pituophis catenifer catenifer) reaching up with mouth wide open, California, USA

James Christensen / Great Basin Gopher Snake (Pituophis catenifer deserticola) in habitat, near Imnaha, Oregon

John Cancalosi / Pacific Gopher Snake (Pituophis catenifer catenifer) swallowing a mouse, Oregon, USA

Claudio Contreras / Mexican pine snake (Pituophis deppei) coiled on rock, Huichol Sierra, western Mexico, July

Michael D. Kern / Hypo stillwater Bullsnake {Pituophis catenifer sayi} Central USA

Michael D. Kern / Bull Snake {Pituophis melanoleucus sayi} hybino (albino x hypo) colouration, captive, from Central USA

Michael D. Kern / Bull Snake {Pituophis catenifer sayi} captive, from Central USA

Michael D. Kern / Bull Snake {Pituophis catenifer sayi} captive, from Central USA

David Welling / Bullsnake (Pituophis melanoleucus sayi) drinking in pool, Rio Grande Valley, Texas, USA

Rolf Nussbaumer / Bullsnake {Pituophis catenifer sayi} adult, Rio Grande Valley, Texas, USA, May

Rolf Nussbaumer / Bullsnake {Pituophis catenifer sayi} adult, coiled supporting its body weight, Rio Grande Valley, Texas, USA, May

Tony Phelps / Pine gopher snake {Pituophis melanoleucus} captive, from North America

Philippe Clement / Gopher snake / Bullsnake (Pituophis catenifer), Arizona, USA. Captive.

Barry Mansell / Albino Southern pinesnake (Pituophis melanoleucus mugitus) Florida, USA

Tui De Roy / Gopher Snake (Pituophis catenifer) in desert steppe, San Carlos, Baja California, Mexico

Tony Phelps / Bull snake {Pituophis melanoleucus sayi} captive, from central USA

Tony Phelps / Bull snake {Pituophis melanoleucus sayi} captive, from Central USA

Mary McDonald / Pine gopher snake (Pituophis melanoleucus) California, USA

Tony Phelps / Bull snake {Pituophis melanoleucus sayi} captive USA

John Cancalosi / Black Pine Snake {Pituophis melanoleucus lodingi} portrait in hollow of tree, Mississippi, USA.

John Cancalosi / Black Pine Snake {Pituophis melanoleucus lodingi} in hollow of tree, Mississippi, USA.

Todd Pusser / Pine gopher snake {Pituophis melanoleucus} coiled in grass, North Carolina, USA

Todd Pusser / Pine gopher snake {Pituophis melanoleucus} hatchling held in hand, NOrth Carolina, USA.

Todd Pusser / Biologist Jeff Beane radio tracking a Pine gopher snake {Pituophis melanoleucus} North Carolina, USA.

Barry Mansell / Southern pine snake, juvenile {Pituophis melanoleucus mugitus} Florida, USA.

Donald M. Jones / American Badger (Taxidea taxus) with Bullsnake (Pituophis melanoleucus) prey, National Bison Range, Moise, Montana

Pete Oxford / Southern Pinesnake (Pituophis melanoleucus mugitus), native to the southeastern United States

Pete Oxford / Louisiana Pinesnake (Pituophis ruthveni), native to the southeastern United States

Pete Oxford / Black Pinesnake (Pituophis melanoleucus lodingi) among pine needles and pine cone, native to the southern United States

Pete Oxford / Black Pinesnake (Pituophis melanoleucus lodingi) climbing tree, native to the southern United States

Doug Wechsler / Pine gopher snake juvenile {Pituophis melanoleucus} New Jersey USA