BOID

any member of the snake family Boidae, which includes boas and pythons. The more than 80 species occur chiefly in the tropics, worldwide. Almost all have two lungs, a pelvic girdle, and vestigial hindlimbs, which show as small spurs opposite the vent. Some have heat-sensitive lip pits. Boids tend to be iridescent, especially after shedding the skin. Nonvenomous, they kill by biting and constricting. The family includes the world's largest snakes (reticulated python and anaconda ) as well as small burrowing forms.