Native to Round Island, a tiny island off the coast of Mauritius, the Round Island Burrowing Boa preferred to live on the topsoil layers of volcanic slopes. It was once found on several other islands around Mauritius, but its population had dwindled by the 1940s, and it could only be found on Round Island after 1949. It was last seen in 1975.
Cause of extinction:The introduction of non-native species of rabbits and goats to the island destroyed vegetation and upset the boa's habitat. The changing landscape did not suit its health.