中文版：
一天，動物園的管理員們發現袋鼠從籠子裡跑出來了，於是開會討論，一致認為是籠子的高度過低，所以他們決定將籠子的高度由原來的1米加高到2米。結果第二天他們發現，袋鼠還是跑到外面來，所以他們又決定再將高度加高到3米。
沒想到隔天居然又看到袋鼠全跑到外面，於是管理員們大為緊張，決定一不做二不休，將籠子的高度加高到10米。
一天，長頸鹿和幾隻袋鼠在閒聊，「你們看，這些人會不會再繼續加高你們的籠子？」長頸鹿問。
「很難說。」袋鼠說，「如果他們再繼續忘記關門的話！」
English：
One day, the staff members of a zoo called a meeting to discuss the problem--how to deal with the kangaroos that were found out of the cage. They came to the conclusion that the cage was placed too low and decided to raise it from one to two meters high. But the next day the kangaroos were still out of the cage,and they again raised the cage to three meters.
Quite beyond their expectation the next morning they saw the kangaroos still free to go out. They were alarmed and determined to go to all the length by raising the cage to the height of ten meters.
Later a giraffe, while chatting with some kangaroos, asked them, 「Do you think they will go on raising your cage?」
「Hard to say,」 said a kangaroo, 「if they continue forgetting to fasten the cage door.」
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