The boa constrictor is a large snake, although it is only modestly sized in comparison to other large snakes, such as the reticulated python and Burmese python, and can reach lengths from 3–13 ft (0.91–3.96 m) depending on the locality and the availability of suitable prey. Clear sexual dimorphism is seen in the species, with females generally being larger in both length and girth than males. As such, the usual size of mature female boas is between 7 and 10 ft (2.1 and 3.0 m), and 6 and 8 ft (1.8 and 2.4 m) for the males. Females commonly exceed 10 ft (3.0 m), particularly in captivity, where lengths up to 12 ft (3.7 m) or even 14 ft (4.3 m) can be seen. A report of a boa constrictor growing up to 18.5 ft (5.6 m) was later found to be a misidentified green anaconda.
Boa Constrictors live on their own. Only if they want to mate they interact with each other. Young boa constrictors climb into trees and shrubs to forage. However they become mostly terrestrial as they become older and heavier. Boa constrictors strike when they perceive a threat. Their bite can be painful, especially from large snakes, but is rarely dangerous to humans.
Food and diet: A wide variety of small to medium sized mammals and birds. Young boa constrictors eat small mice, birds, bats, lizards and amphibians. First the boa strikes at the prey, grabbing it with its teeth. Then proceeds to constricts the prey until death before consuming it whole. It takes the snake about 4-6 days to fully digest the food, depending on the size of the prey and and the local temperature. The snake may not eat for a week to several months.
In the wild
North, Central and South America. Red Tail boas Live in a wide variety of environmental conditions from tropical rainforests to arid semideserts country. Their prey is commonly found in or along rivers and streams, as it is a very capable swimmer.
Prey includes a wide variety of small to medium-sized mammals and birds. The bulk of their diet consists of rodents, but larger lizards and mammals as big as ocelots are also reported to have been consumed. Young boa constrictors eat small mice, birds, bats, lizards, and amphibians. The size of the prey item increases as they get older and larger.