What is the ratio of poisonous snakes to unpoisonous snakes?
I was just watching a movie on T.V. and one character got bitten by a snake. I was suddenly curious as to what percent of all snakes are poisonous -OR- what the ratio is of snakes that are poisonous to snakes that aren't poisonous.
Also, if you could provide a few details as to which are the most common poisonous snakes, that would be interesting. I love to learn, so tell me all you know! :D
Thank you for your help! :)
P.S. In North America, I mean. But you can talk about anywhere you want, still.