Once upon a time in jungle, a tiger and a cat became very close friends. The tiger was very clumsy when catching food. Despite his speed and power, he just made too much noise while stalking. The cat, on the other hand, was a very skillful hunter. The tiger envied the cat and asked him to become his teacher."OK, but you must call me 'Sir' from now on."said the cat. "Yes Sir", answered the tiger. A rigorous training schedule started for the tiger in the jungle. The cat taught everything about ambush, counter ambush, guerrilla warfare, conventional warfare, long range penetration, night attack, dawn attack, hasty attack, deliberate attack, booby traps, etc. Finally the cat was satisfied. "Your training is completed. You have become as skilled in jungle hunting as Rambo. Good bye, dear friend, I must move to another jungle now." The tiger started to apply his newly acquired hunting techniques with great success. However, he was still losing about 25% of his prey for no apparent reason. Finally he realized that the culprit was his tail that was still making an awful lot of noise while stalking. The tiger became very angry with the cat who hadn't pointed out this weakness to him. The cat had a reason of his own. She wanted to have an early warning chance to escape should the tiger ever attack her. And that's also why the cat moved to another jungle. And besides, the tiger also knew his teacher' weak point. The tiger is still looking for his teacher to punish her for the incomplete training. That's why cats always hide their poop in order to cover up their weak point because they and theirs students know each other's strong and characteristic smell.