Thump! Thump! Thump!"" The fat rabbit knocking at Miss Molly's door gives birth in her kitchen the next morning to a boxful of baby rabbits, and because ""they are so cute"" she keeps them all until even some of the new ones have babies and there are rabbits everywhere. Finally she puts a ""free rabbits"" ad in the paper, refuses the butcher who answers it, but welcomes a man who wants to keep the bunnies on his grassy island. When last seen, however, Miss Molly has taken in a pregnant cat and decided to keep the kittens because ""they are so cute."" Henry Huggins' guppy explosion was funnier, but Parish's variation has the advantage of being easier to read than many recent titles in the beginning reader format.