Which snake imitates a rattlesnake when threatened?

My dad did his doctoral dissertation in biochemistry in 1959 on the effect of rattlesnake venom on bullsnake tissue. Bullsnakes are immune to rattlesnake venom.

ChewyGazelle68623, my goodness! During this little foray to the park was there any constricting of children?

I love snakes !! I babysat a young boa constrict tu or. Took him to the park on a Sunday to let.all the kids play with him. it was pretty cool!!