Cuckoo and a female grasshopper warbler (with brood patch), fledged goldfinch, greenfinch, chaffinch, song thrush and mistle thrush.  Ringing session resulted in 100 birds of 21 species.  More info here: http://gowerbirdringinggroup.blogspot.co.uk/2015/05/oxwich-marsh-20-may-2015-fledglings-and.html