The story uses 11 kinds of animals along the creek such as hippopotamus, duck, turtle, platypus, crocodile, etc., and the four directions of front, back, top and bottom to guess "who is behind me (in front, above and below)?" like a solitaire game to arouse children's curiosity. The game is designed to arouse children's curiosity and let them make guesses according to the clues in the pictures, as well as recognize the animals in the forest and understand the concept of spatial orientation.
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