The rattlesnake is a tube-toothed venomous snake whose venom is blood-circulating. Rattlesnakes are generally about 1.5-2 meters long. The rattlesnake body is yellow-green with a diamond-shaped dark brown spot on the back. Rattlesnakes have a string of horny rings at the end of their tails, the remnants of multiple molts. When encountering an enemy or moving sharply, swing the tail ring of the tail quickly, which can swing 40-60 times per second, and can make a loud noise for a long time, causing the enemy to dare not approach or be scared away.

Rattlesnakes vary in size from species to species, but the scales on the top of their heads are small.