Men who trap animals in Africa for zoos in America say that one of the hardest animals to catch is the ringtailed monkey. For the Zulus of that continent, however, it's simple. They've been catching this agile little animal with ease for years. The method the Zulus use is based on knowledge of the animal. Their trap is nothing more than a melon growing on a vine. The seeds of this melon are a favorite of the monkey. Knowing this, the Zulus simply cut a hole in the melon, just large enough for the monkey to insert his hand to reach the seeds inside. The monkey will stick his hand in, grab as many seeds as he can, then start to withdraw it. This he cannot do. His fist is now larger than the hole. The monkey will pull and tug, screech and fight the melon for hours. But he can't get free of the trap unless he gives up the seeds, which he refuses to do. Meanwhile, the Zulus sneak up and nab him.