bull snake

US /ˈbʊl snæɪk/
UK /ˈbʊl snæɪk/
"bull snake" picture
1.

a large, non-venomous snake (Pituophis catenifer sayi) native to central North America, known for its loud hiss and ability to mimic rattlesnakes

:
The farmer found a large bull snake in his barn, but he knew it was harmless.
Bull snakes are often mistaken for rattlesnakes due to their defensive behaviors.