Between May and September, the two, tiny, low-lying Keeragh Islands hold a large, nationally-important colony of breeding Great Cormorants.
In the past, the islands supported breeding terns and possibly the last colony of Great Auk in Ireland before these large, flightless birds became extinct.
In winter, the predator-free islands are an important and safe night roost for wildfowl and other birds.
Both islands are surrounded by a wide, boulder-strewn rock platform that supports a diversity of seaweeds. The Keeragh Islands are Special Protection Area (SPA) IE004118 for Great Cormorants.