Coexisting With Wild Snakes › C — How NOT to identify a venomous snake Rules 3 & 4: “I heard it rattle!” and the protruding brow Updated September 13, 2026 Share this pageShare…Facebook (opens in a new tab)EmailCopy link In this lesson: why a rattling sound doesn't mean a rattlesnake, and why the "mean-looking brow" is a trait you shouldn't be close enough to see. This lesson is part of Coexisting With Wild Snakes. Enrollment is free and self-paced (about 5 hours). Enroll free to read this lesson Already enrolled? Sign in Sign in Keep me signed in Forgot Password? Sign In Don't have an account? Register Now