A flock of large gulls are congregating in the fields at Penrhyn Bay at the moment with up to 400 birds roosting over high tide in the fields opposite the golf course. Yestreday two birds had me puzzled as they stood out from the usual 'argenteus' Herrings and Lesser black backed.
Both showed features associated with Caspian, but also showed features that aren't. Any opinions would be appreciated.
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