bull snake
US /ˈbʊl snæɪk/
UK /ˈbʊl snæɪk/

1.
a large, non-venomous snake (Pituophis catenifer sayi) native to central North America, known for its loud hiss and ability to mimic rattlesnakes
:
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The farmer found a large bull snake in his barn, but he knew it was harmless.
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Bull snakes are often mistaken for rattlesnakes due to their defensive behaviors.