After it was all over and Noah lowered the ramp of the ark for all the animals to leave, he told the animals: “Go forth and multiply.”
All the animals left except two snakes who lay quietly in a corner of the ark.
“Why won’t you go forth and multiply?” demanded Noah.
“We can’t,” answered the snakes. “We’re adders.”
From : http://coffeeklatch.pfitzinger.net/.