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Lizards. A creeping creature that has four legs that constantly forage around a river or moist area of water because its main diet is small fish or other animals that measure much smaller than itself. 
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In a sense, the animal is fast in flight because it has a long, elastic contour that makes it easier to chase prey or even to escape predators. This animal is less dangerous to man because the lizard has no poison lethal to man, but one must be aware of its saliva because it contains a host of bacteria. So be cautious.