Seabird and Restoration History: Although historic nesting records of tern use are scant, anecdotal reports suggests birds have used the site periodically over the last 40 years. Tern restoration began in 1991, with a gull management program. By 1993, Jenny Island was the only active tern colony in Casco Bay. Tern numbers peaked in 1998 with 1,175 pairs. However, significant predation by Great-horned Owls, Black-crowned Night-herons, and mink decimated this colony and by 2001 only 59 pairs nested. The colony has since rebounded, and in 2012 over 800 pairs of terns nested.
Nesting and Migratory Birds: Breeding waterbirds include primarily Common Terns, with small numbers of Roseate and Arctic Terns. Common Eiders also nest here. Despite the island's small size and proximity to the mainland, 118 bird species have been recorded on the island, including Maine notable records for Sooty Tern, Sabine's Gull, and Bridled Tern.
Island Monitoring, Research and Management Projects: The Jenny Island field season begins in late May and continues through late July. The island supervisor is responsible for coordinating the timing of specific projects throughout the field season. Work includes, but is not limited to, the following projects: annual tern, laughing gull and eider census; tern productivity, chick growth and provisioning studies; laughing gull kleptoparasitism observations; vegetation monitoring and management; daily weather and bird lists; and predator management.
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