1. The main reason for the bifurcation of the snake's tongue tip: the snake uses the bifurcation of the tongue tip to determine the direction of progress and the source of the smell. Although the snake's tongue has no taste buds, it is used as a taste organ to judge the traces left by its prey, spouse or itself.

2. Experiments show that if the forked tip of the tested snake is cut off, it will lose the ability to track odor traces; If the tunnel from Shekou to the inspection agency is blocked, it will lose its ability to distinguish and can only turn around.