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|Noun||1.||bull-snake - any of several large harmless rodent-eating North American burrowing snakes|
colubrid, colubrid snake - mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes
Pituophis melanoleucus, gopher snake - bull snake of western North America that invades rodent burrows
pine snake - any of several bull snakes of eastern and southeastern United States found chiefly in pine woods; now threatened