The island is the location of former military fortifications, but is now owned by the American Museum of Natural History which is working to restore its ecosystem.Gull Island is a major stopover for birds following the Atlantic Flyway and was the home of large colonies of nesting terns up until the end of the 19th century, when many birds were killed as a result of the millinery trade and the construction of military fortifications on the island.However, the Roseates are well suited to the narrow crevices and hard-to-reach spaces created in this environment, with their young quite adept at vanishing in between the rocks, only becoming accessible when a parent calls to summon them.[10] The Great Gull Island Program has an ongoing partnership with several Argentine projects that monitor the terns during the winter and spring months.[11] Occasionally, as a show of support, an Argentine delegation will arrive to assist in preparation work for "peak week", when hatchings-per-day can range into the thousands.