Related Clues:

• Plumbers' probes
• Medusa’s hair
• Moccasins, for example
• Treacherous people (with ladders?)
• Treacherous types: racers, perhaps
• Hiss sources
• Mambas and boas
• They're not to be trusted
• Animals that make up Medusa's hair
• Herpetol-ogist's study