Overview
The Puerto Rican Boa (Chilabothrus inornatus), locally known as Culebra Majá, is the largest native terrestrial predator on the island of Puerto Rico. Inhabiting lush karst hills and subterranean limestone caverns, this magnificent, non-venomous constrictor is world-famous for its daring, acrobatic hunting technique: hanging upside-down from stalactites at cave mouths to snatch flying bats right out of mid-air in pitch-black darkness.
Biology and Physical Characteristics
Chilabothrus inornatus has a muscular, heavy body colored iridescent bronze-brown, dark tan, or slate-grey, patterned with irregular darker brown bars and blotches that fade toward the tail. Its smooth dorsal scales display an exquisite, peacock-like rainbow sheen when hit by sunlight. It possesses a prehensile tail and heat-sensitive pits along its lips that detect the body heat of warm-blooded prey.
Behavior and Ecology
A stealthy nocturnal hunter, the Puerto Rican Boa climbs effortlessly into cave ceilings. At dusk, when hundreds of thousands of bats emerge from roosting caverns, boas anchor themselves by their tails to rocky crevices, dangling into the flight corridor and striking blindly into the swarm with open jaws. In forest canopies, it hunts resting birds and native rodents.
Conservation and Human Impact
Assessed as Vulnerable by the IUCN, the Puerto Rican Boa was historically pushed to near-extinction by extensive sugarcane deforestation and predation by introduced Asian small mongooses. Following federal protections under the US Endangered Species Act and island-wide forest regeneration, wild populations have staged a significant, heartening recovery.
Interesting Factoid
Puerto Rican Boas act like living flytraps at cave openings; hanging by their tail-tips from cave ceilings, they snap their jaws shut on flying bats passing in total darkness.