The tail often exhibits reddish-brown tones, giving rise to the term "red-tailed boa" for certain subspecies. Boas also possess pelvic spurs — small vestigial limbs near the base of the tail ...

One of the most recognized subspecies, the red-tailed boa (Boa constrictor constrictor), is particularly noted for its striking reddish-brown tail. Boa constrictors have heat-sensing pits located ...