Date: Most breeders in Irish colonies like this May and 1st half of June.
Photo : Olly Slessor
Date: June 23,
Typical breeders in Ireland with small chicks
Photo: Julie Baer
Date: July 29,
Maximal extent of red on the bill in Ireland seen last 10 days of July (when shot taken) and early August.
Photo Anthony Mc Geehan