Hungry Hen by Richard Waring, illustrated by Caroline Jayne Church, is another of my favorite preschool/Kindergarten read alouds. I usually read a more conventional chicken and fox story right before it, like Hattie and the Fox. Then I say that there are other ways for a book like that to end.
Hungry Hen is the story of a fox that waits and waits for the hen to get bigger and bigger. As he waits, he gets skinnier and skinnier and the hen becomes enormous. Finally, he can wait no longer, so he runs to the henhouse and… Well, you just have to read it. And the stunned silence that the kids give you after the end is so great. And then the laughter. I usually have problems taking the book away with me afterwards because they want to read it again and again.