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.
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 recolonizethe 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).
BirdLife International (2020) Important Bird Areas factsheet: Greer's Island (Massmount), Mulroy Bay. Downloaded from http://www.birdlife.org on 08/07/2020.