Definition that contains harmless
- storeria occipitamaculata harmless woodland snake of southeastern United States
- ring snake harmless European snake with a bright yellow collar; common in England
- puff adder harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed
- ringed snake harmless European snake with a bright yellow collar; common in England
- sand viper harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed
- grass snake harmless European snake with a bright yellow collar; common in England
- intestinal flora harmless microorganisms (as Escherichia coli) that inhabit the intestinal tract and are essential for its normal functioning
- red-bellied snake harmless woodland snake of southeastern United States
- natrix natrix harmless European snake with a bright yellow collar; common in England
- hognose snake harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed