Rooster's Off to See the World (The World of Eric Carle) by Eric Carle

One fine morning, a rooster sets off to see the world. Soon he's joined by two cats, then three frogs, then four turtles, then five fish. But one group by one, his new friends decide to head home, leaving the rooster alone again -- and ready to return to his own comfortable home as well. Bold, colorful collage illustrations, a beguiling story, and a simple introduction to number sets, addition, and subtraction combine to make Rooster's Off to See the World a delight for Eric Carle's many young fans.