nonvenomous snakes 约占所有现存蛇类的三分之二
ADJ (of a snake, spider, etc) not venomous (蛇、蜘蛛等)无毒的
Any of several nonvenomous snakes, such as the milk snake of North America, popularly believed to be harmful.
蝰蛇无毒蛇中一种，如北美的乳蛇，普遍认为有害。
Any of various dark-colored, chiefly nonvenomous snakes, such as the black racer or the black rat snake of North America.
黑蛇一种黑色，多为无毒蛇类，如北美黑游蛇属黑蛇和食鼠黑蛇。
Nonvenomous tan and brown king snake with an arrow-shaped occipital spot; southeastern ones have red stripes like coral snakes.
无毒的茶色和褐色王蛇，后头部有箭头形状的斑点；东南部的品种有红色的条纹，与珊瑚蛇相象。
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