Boa Constrictors are a species of large snake that is non-venomous. They instead constrict their prey once caught, asphyxiating them or cutting off blood supply. Their patterns vary, but are still recognisable. There are up to 10 subspecies. These snakes are largely solitary, only interacting with other snakes when they seek out mates. They tend to be active during the night (are nocturnal) but also enjoy sun basking.
By Christian Mehlführer, User:Chmehl (Own work) [CC BY 2.5 (http://creativecommons.org/licenses/by/2.5)], via Wikimedia Commons