Hoop snake

According to folklore, the distinguishing feature of a hoop snake is that it can grasp its tail in its jaws, like the ouroboros of Greek mythology, and roll after its prey like a wheel.

It is hypothesised that the snake has the ability to rapidly constrict, quickly reducing the circumferences of its body to entrap the limb of a kangaroo, wallaby, dingo or human.

London):[4] As other serpents crawl upon their bellies, so can this; but he has another method of moving peculiar to his own species, which he always adopts when he is in eager pursuit of his prey; he throws himself into a circle, running rapidly around, advancing like a hoop, with his tail arising and pointed forward in the circle, by which he is always in the ready position of striking.

Naturalist Raymond Ditmars placed $10,000 in trust at a New York bank for the first person to provide evidence of a hoop snake.

[5] Some have suggested it is a distorted description of the sidewinder of the American Southwest, or of mud snakes, which will occasionally lie in a loose hoop shape.