Black Terns are scarce passage migrants in Limerick and Coonagh has proved to be most reliable location for them in the County in recent years. They have been recorded previously at the site on autumn migration, with one in Sept. 2010, four together in Sept. 2011 and one in Aug. 2012. The site has also atteacted the much rarer White-winged Black Tern once previously in August 2014.
Two juvenile Arctic Terns also spent most of the week at the site. Arctic Terns are occasional passage migrants at the site, with notable influxes of 63 birds in April 2013 and 13 birds the following September.