text: All subspecies are referred to as `` Boa constrictors '' , while the nominate subspecies , B. c. constrictor , is often referred to specifically as the `` red-tailed boa '' .
simplified: All subspecies are referred to as `` boa constrictors , '' while the nominate subspecies , B. c. constrictor , is often referred to specifically as the `` red-tailed boa . ''