The rarest boa in the world is Corallus cropanii, known only from its type locality in southeastern Brazil. It receives no formal protection. More than 40 years have passed since the last specimen was collected, and though it has not been formally declared extinct, many authorities believe this is the case.
The Mona boa, Epicrates monensis, including both subspecies, E. m. granti and E. m. monensis, is listed as Endangered by the IUCN, owing to the fragmentation of habitat and populations, a low number of adults that is declining, habitat degradation, and introduced predators. A captive-breeding program for the species was begun in 1985, and there is now a self-sustaining captive population of several hundred individuals maintained in zoos. Reintroduction to former habitats was started in 1993, after rats and cats were eliminated from those areas. The reintroduced populations appear to be breeding.
The four species listed as Vulnerable by the IUCN are the Jamaican boa, Epicrates subflavus; Dumeril's boa, Boa dumer-ili; the Madagascar boa, Boa madagascariensis; and the Madagascar tree boa, Boa mandrita. At the time of this writing, all are believed to be stable.
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