Boids are boas and pythons (anacondas are boas) The difference between them and colubrids is boids still have 2 fully developed lungs and they have a pelvis with remnants of hind legs still apparent (anal spurs) ..colubrids are newer and more evolved, streamlined and in most cases much faster moving. They only have one developed lung, no pelvis and no spurs. By far, colubrids make up the vast majority of snake species on the planet.
Also...No boid is venomous...there are several species of rear fanged venomous colubrids.
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