A young boy is just sitting down for a snack when someone knocks at the door. Who could it be? It's an elephant who would like to join him and seeing there is room for one then there must be room for two and so it goes. This is a cumulative tale with animal after animal appearing at the door and finding just enough room for one more. You count your way through to ten and add the animals as you go until "the house went..." and I'll leave it to you to find out.