You cannot reliably tell if a snake is dangerous by color, pattern, head shape, or pupil shape alone
Treat every unknown snake as potentially venomous
Learn the venomous species in your area
Look for local field guides or wildlife agency identification resources
Check for species-specific markings only when you are certain of the region and species group
Do not handle the snake to identify it
Keep a safe distance and use binoculars or a zoom camera if needed
If bitten, seek emergency medical help immediately
If possible, note the snake’s appearance from a distance for identification by experts
Remember that many harmless snakes mimic venomous ones