Red on the head,you're dead!
Alright, I'm getting conflicting information here kids. Red on the head your dead....Coral Snake black on the head...dead....Pit viper dead, not pit viper...neuro toxin....dead. Triangular head, dead....skinny head....dead.
I'm with SWGB...If it slithers, coils or shakes, it is probably a harmful snake.