"In the past, Bolyeria was found in Mauritius on Gunner's Quoin, Flat Island, Mauritius, Round Island and Ile de la Passe. Later this snake species was restricted only to Round Island... found in the palm groves of mid-altitude top-soil layers on volcanic slopes...The introduction of rabbits and goats to the island in 1840 resulted in damage to the vegetation, consequently causing soil erosion on the volcanic slopes and deterioration of palm forest habitat. This decline in habitat quality is thought to have been the main reason for the extinction of the Round Island Burrowing Boa."