Double-headed serpent (article) Khan Academy

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Double-headed Serpent - Mexicolore

Double-headed serpents feature strongly in the myths and religion of ancient Mexico, and Mesoamerica in general: one of the region’s most important deities was of course Quetzalcóatl, the Feathered Serpent (read more on this in our feature on D H Lawrence and the Plumed Serpent, below).…

Polycephaly - Wikipedia

Most two-headed snakes only live for a few months, though some have been reported to live a full life and even reproduced, with the offspring born normal. A two-headed black rat snake with separate throats and stomachs survived for 20 years. A two-headed albino rat snake named "We" survived in captivity for 8 years.…