hoop snake

hoop-snake的词性：
n.（名词）

1. Any of several snakes, such as the mud snake, said to grasp the tail in the mouth and move with a rolling, hooplike motion.
铁环蛇：一种蛇，如泥蛇，据说它们能将尾衔于口中，象滚铁环一样前进