Coexisting With Wild Snakes › C — How NOT to identify a venomous snake Rules 5 & 6: heat-sensing pits and swimming on top Updated September 23, 2026 Share this pageShare…Facebook (opens in a new tab)EmailCopy link In this lesson: what heat-sensing pits are, why they are a poor rule, and why swimming posture is only ever a hint. 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