Why is it called the birds and the bees when it has nothing to do with birds or bees?

There is actually a story about making babies called Birds, Bees, Babies in which the birds and the bees make a baby and then the stork delivers it. They use frogs and snails and puppy dog tails. The story is a way to satisfy the curiOSity of children who are asking where babies come from. The birds and bees story is called Birds, Bees, Babies and was written by J.L. Sweat.