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Pituophis catenifer - Wikipedia, The Free Encyclopedia
Pituophis catenifer is a species of nonvenomous colubrid snake endemic to North America. Six subspecies are currently recognized, including the nominotypical subspecies, Pituophis catenifer catenifer, described here.
https://en.wikipedia.org/wiki/Pituophis_catenifer
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Bullsnake - Wikipedia, The Free Encyclopedia
The bullsnake (Pituophis catenifer sayi) is a large nonvenomous colubrid snake. It is currently considered a subspecies of the gopher snake (Pituophis catenifer).
https://en.wikipedia.org/wiki/Bullsnake
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ADW: Goher Snake - Pituophis catenifer
Pituophis catenifer is found from southwestern Canada south to northern New Mexico.
http://animaldiversity.org/accounts/Pituophis_catenifer/
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BioKIDS - Pituophis melanoleucus, Bullsnake
Pine snakes are the second-largest snakes in northeastern North America. They are 91 to 254 cm long and up to 5 cm in across. They are powerful constrictors, so they wrap themselves around their prey to kill it.
http://www.biokids.umich.edu/critters/Pituophis_melanoleucus/
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Bullsnakes vs Rattlesnakes
Confused about the differences in bullsnakes and rattlesnakes? Zookeeper Bryon Shipley can help clear ups some myths and misconceptions about these two snakes.
http://havesnakeswilltravel.com/bullsnakes-vs-rattlesnakes-by-bryon-shipley-rattlesnake-researcher/betty/
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Bull Snake - Reptile - Britannica
Pituophis catenifer North American constrictor snake of the family Colubridae.
http://www.britannica.com/animal/bull-snake
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Pituophis catenifer (Bullsnake, Gophersnake, Gopher Snake)
Information and population statistics for the gopher snake from IUCN Red List of Threatened Species
http://www.iucnredlist.org/details/63869/0
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Great Basin Gopher Snake - Pituophis catenifer deserticola
Photos and information about gopher snakes
http://www.californiaherps.com/snakes/pages/p.c.deserticola.html
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Gopher Snakes - DesertUSA
Gopher Snakes, among the largest and most widespread snakes of the North American deserts.
http://www.desertusa.com/reptiles/gopher-snake.html
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Gopher Snake Care Sheet - ReptilesMagazine
Gopher snakes are common throughout much of the United States. Learn how to properly care for your gopher snake with this care sheet.
http://www.reptilesmagazine.com/Care-Sheets/Gopher-Snake-Care-Sheet/
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Pacific Gopher Snake - Wikipedia, The Free Encyclopedia
The Pacific gopher snake (Pituophis catenifer catenifer) is a subspecies of large nonvenomous colubrid snake native to the western coast of the United States.
https://en.wikipedia.org/wiki/Pacific_gopher_snake