Green Cay is a small six hectare volcanic island comprised of igneous bedrock reaching a maximum elevation of 30m, covered in xerophytic coastal scrub. The island is currently privately owned and is a proposed protected areas to be included within the system of national parks.
Green Cay is an important nesting site for the Roseate Tern. In 1996, a total of 1755 Roseate Terns, were counted making Green Cay the largest breeding colony in the US and British Virgin Islands.
Non-bird biodiversity: The terrestrial vertebrate fauna on Green Cay is limited to a few species of common lizard, primarily Anoles.
Pressure/threats to key biodiversity
Continued high visitation to the adjacent island of Sandy Spit by the yacht industry will result in disturbance to the nesting site unless mitigated.