Snakes alive!

Q:    Is there a difference between a rat snake and a corn snake?

 A:   The two are the same snake. It just depends on what you learned to call it when first encountered.

 Q: just saw a red, yellow and black snake in my yard. I know it was either a coral snake or a type of king snake. What is the saying to help identify it?

A:   Red on black, friend of Jack. Red on yellow kill a fellow.