Trigonocephalus cenchris, Print, Agkistrodon contortrix is a species of venomous snake, a pit viper, endemic to Eastern North America; it is a member of the subfamily Crotalinae in the family Viperidae. The generic name is derived from the Greek words ancistro (hooked) and odon (tooth), and the specific name comes from the Latin contortus (twisted, intricate, complex); thus, the scientific name translates into "twisted hook-tooth". The common name for this species is the copperhead. Its behavior may lead to accidental encounters with humans. Five subspecies are currently recognized, including

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Trigonocephalus cenchris, Print, Agkistrodon contortrix is a species of venomous snake, a pit viper, endemic to Eastern North America; it is a member of the subfamily Crotalinae in the family Viperidae. The generic name is derived from the Greek words ancistro (hooked) and odon (tooth), and the specific name comes from the Latin contortus (twisted, intricate, complex); thus, the scientific name translates into "twisted hook-tooth". The common name for this species is the copperhead. Its behavior may lead to accidental encounters with humans. Five subspecies are currently recognized, including the nominate subspecies described here., 1700-1880

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