Go Forth and Multiply!
When God created all of the animals, she told them to go forth and multiply. A year later, God visited the Garden of Eden to see how things were progressing, and was surprised to learn that all the creatures multiplied except for the snakes.
"What's the matter," God asked the snakes.
"We can't multiply because we're adders," said the snakes.
So God chopped down some trees and made the snakes some log tables...and everyone was now pleased!