University of Nebraska
University of Nebraska: Black Rat Snake
Similar to the Fox Snake, the young Black Rat Snake kills by constriction. This site by the University of Nebraska includes description, habitat, diet, and size of the Black Rat Snake.
University of Nebraska
University of Nebraska: Great Plains Rat Snake
The nonpoisonous Great Plains Rat Snake is sometimes called the Corn Snake. The University of Nebraska presents more information including a brief description and photo.
Canadian Museum of Nature
Canadian Museum of Nature: Gray Ratsnake
Previously known as black ratsnakes, the gray ratsnake is one of the largest snakes found in Canada. Described are its characteristics, young and food.
Other
Kingsnake.com: Central American Ratsnake
With a general overview of the Central American Ratsnake, Kingsnake.com introduces five subspecies, common names, range, behavior, habitat, size, coloration, pattern, and color photo.
Other
Kingsnake.com: Cornsnake
Also known as the Red Rat Snake, the Cornsnake can be found throughout the United States. Links to both subspecies are available on the Kingsnake.com website.
Other
Kingsnake.com: Ratsnake
Kingsnake.com discusses the Ratsnake and each of its five subspecies. Select the Texas Ratsnake, Black Ratsnake, Yellow Ratsnake, Everglades Ratsnake, or the Grey Ratsnake to find additional information. Photo included.
Other
Kingsnake.com: Baja Ratsnake
Found in Southern California, the Baja Ratsnake is profiled by Kingsnake.com. Color Photo included.