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Site description (2000 baseline)
A small island and surrounding waters in Mulroy Bay, County Donegal. The site has been extended since the previous pan-European inventory (Grimmett and Jones 1989) to include 18 ha of surrounding waters.

Key biodiversity
This site was formerly of importance for Sterna sandvicensis, holding the second-largest breeding colony in Ireland (180 pairs) in 1984, although more recently numbers have declined (with none breeding in 1995). The species may yet recolonize˜the birds that used to nest at the site are now believed to breed at Inch Lake (site 005). There are also breeding Sterna paradisaea (20 pairs, 1984) and a nationally important colony of Larus ridibundus (180 birds, 1984).

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Greer's Island (Massmount), Mulroy Bay (Ireland). Downloaded from https://datazone.birdlife.org/site/factsheet/greers-island-(massmount)-mulroy-bay-iba-ireland on 16/01/2025.