And easily confused with a Milk Snake which is not poisonous. Red touches yellow, kill a fellow. Red touches black, poison lack.
"Red and yellow, kill a fellow.
Red and black, friend of Jack."
Never found out who Jack was.
Its worth noting that the color patterns of coral snakes varies throughout the world and the red on yellow works only in parts of the US.
I come across them on occasion and they present very little threat despite being highly venomous. They aren’t in the least bit aggressive unless cornered with no way out. I occasionally find and remove them from my backyard with ease.