Iolo was caught and tagged at Ponterhydfendigaid, Ceredigion, Wales on the last day of May 2012. Since being tagged he has moved from Wales across the Midlands into Norfolk. Iolo hatched in the summer of 2011 and is a one year old male.

Iolo was the first of our Welsh Cuckoos to make a move east, having arrived near Mildenhall, only 20km (12 miles) from BTO HQ, on 7 June - a week after he was tagged near Tregaron! By11 June he had moved 40km (25 miles) north to a location near to Tottenhill, 10km south of King's Lynn. The last transmissions received from Iolo's tag on 16 June indicated that he was still in that area.