The Flying Tortoise :

A monkey and a tortoise were best friends. The tortoise saw monkey flying from one tree to another and said, "I also want to fly like you." So, the monkey curled his strong tail around a branch, and showed how they sprang from one tree to another. Tortoise said, "It looks hard." And without another word, his head disappeared into his shell and he went fast asleep. Soon it was night and the monkey went away. Then the tortoise came out of the shell and tried to leap on to a branch, but his tiny legs were too short to cling on to it. He fell on to monkey's banana skin.