The boa constrictor is widely distributed from Mexico to South America.
A non-poisonous species that kills by constriction, mainly arboreal but also moves freely on the ground. The female is larger than the male. It has pelvic spurs that are the remains of the hind legs that are found on both sides of the sewer opening. They are larger in males than in females. Males possess hemipenis, a double penis, of which only one is used for mating.
It is a solitary snake and associates with its congeners only to mate. It has a nocturnal or twilight habit, although it does sunbathe to warm itself when it is cold. It is of ovoviviparous reproduction, the embryos develop in the egg inside the body of their mothers. The young are born alive and are independent soon after birth. They usually reproduce during the dry season and gestation lasts from 5 to 8 months depending on local temperatures. They have an average of 25 offspring.
Among their threats are hunting for their skin and meat, loss of their habitat and the capture of specimens for the species trade.