We heard back in January from Grampian Ringing Group that it had been ringed as an adult during a night-time mist-netting session on the Ythan Estuary in August 2016.
|Yellow - Ythan, Aberdeenshire|
Blue - Mill Quarter Bay, Down
Grampian Ringing Group have been colour-ringing Sandwich Terns at the Ythan since 2010 (see here) and we have had a number of their birds recorded in NI (see here and here).
As part of their study, they catch birds at night in mist nets and they sometimes catch other species which they also ring, including Black-headed Gulls. This is the second colour-ringed Black-headed Gull from Grampian we have reported from NI (see here).
Many thanks to David for his report and Calum for the life-history.