1, foraging: rubbing the air. Simulate the sound of water flow. Attract thirsty animals in the desert

2, protection: intimidating the enemy, while swinging to make a sound, can make the enemy have the illusion that his tail is the head, and the real head is down, ready to escape.

Why does a rattlesnake's tail make a sound?

It turns out that there is a kind of horny chain link on the tail tip of rattlesnake, forming a cavity, and the horny membrane divides the cavity into two annular bubbles, like two air oscillators. The rattlesnake kept wagging its tail, and an airflow was formed in the cavity, which oscillated back and forth as soon as it entered and exited, and the cavity made a "rattle" sound.