After the flood was over, and Noah lowered the ramp of the ark for all the animals to leave, he told

After the flood was 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 the corner of the ark. "Why don't you go forth and multiply?" demanded Noah. "We can't," answered the snakes. "We're adders."