Boa imperator "Black, increased melanism gene" (Boa imperator)
IMG boa constrictors are a color mutation that stands for "increased melanism gene." It describes how their color changes as they age.
IMG increasing melatonin gene boa constrictor on white background
Traditionally, boas are gray, cream, or brown bases with oval saddle markings that become more pronounced and very red as they approach the tail.