This one photographed at Enniskillen Tip y'day does look pretty darn good. Photos here:
Seems to have been around for most of January. With Ross's Gull and Bonaparte's Gull also in the province, an enviable day's birding to be had!
Another one from Killala, co. Mayo a couple of weeks ago also looks very much like 'normal range' juvenile Thayer's Gull to me: http://murfswildlife.blogspot.com/20...yers-gull.html