The Virgin Islands boa (Epicrates monensis granti), a blotched brown semi-arboreal snake, occurs on a number of islands from Puerto Rico eastward into the British Virgin Islands . In the U.S. Virgin Islands, it is restricted to extreme eastern St. Thomas . The Virgin Islands boa lives in subtropical dry forests where it hunts at night, eating mainly lizards asleep in trees . During the day, the boas seek refuge in termite nests or under rocks and debris . Although there are no current estimates of the number of Virgin Island boas that remain in the wild , they are rare and their current distribution is extremely disjunct indicating a history of extirpation and decline .
When conditions are favorable, this species can exist in high densities on small islands . However, large-scale habitat destruction and the introduction of exotic mammalian predators have caused severe population declines . The introduction of the Indian mongoose on St. Thomas, St. John, Tortola, and Jost Van Dyke contributed to population declines on these islands . Feral and domestic cats, which prey on adult boas, have become ubiquitous on St. Thomas . Two rat species, also introduced on many islands, are potential predators of young boas . In addition, development on the east end of St. Thomas threatens the remaining boa population there . Currently, the small, uninhabited cays and islets where much of the remaining populations have become concentrated tend to be vulnerable to inundations from the ocean and storms .
A Mona/Virgin Islands boa Species Survival Plan was developed in 1990 . One of the first activities undertaken was a survey of localities likely to harbor previously unknown populations of the Virgin Islands boa . One population was discovered on Isla Culebra, Puerto Rico but despite extensive surveys, no other new populations were found . A captive breeding program, initiated by the Toledo Zoological Gardens in 1985, has proven to be quite successful . By the mid-1990s, more than 100 offspring had been produced from ten founders . Starting in 1993, reintroductions of captive-bred snakes were initiated . Reintroductions on two islands, previously without boa populations but within their historic range, have been extremely successful . On one of these islands, a population of 41 reintroduced boas increased over ten years to nearly 500 snakes . On the other island, 42 snakes reintroduced in 1996 increased in number to 170 snakes within five years . Through these efforts, Virgin Island boa populations have begun to increase dramatically .
 Tolson P.J, and M. A. Garcia. AZA Species Survival Plan Profile Mona/Virgin Islands Boa: A U.S./Puerto Rico Partnership Seeks to Recover Endangered Boa. Accessed at http://www.umich.edu/~esupdate/library/97.01 02/tolson.html
 Platenberg, R. J., F. E. Hayes, D. B. McNair, and J. J. Pierce. 2005. A Comprehensive Wildlife Conservation Plan for the U.S. Virgin Islands. Division of Fish and Wildlife, St. Thomas. 216 pp.
 USFWS. 1992. Species Account, Virgin Islands Tree Boa. U.S. Fish and Wildlife Service, Division of Endangered Species. http://www.fws.gov/endangered/i/c/sac0q.html
 American Zoo and Aquarium Association. 1998. Virgin Islands Boa 98 Fact Sheet. Accessed at http://www.nagonline.net/Fact%20Sheet%20pdf/AZA%20-%20Virgin%20Islands%20Boa%20Species%20Survival%20Plan.pdf
 Peter J. Tolson. 2006. Personal Communication.