Scaup

Female Scaup (4th from right)

Male and Female Scaup, Grafham Water, 11th February 2019 © Ian Dawson
'...the female on 5^th February was off the northwest end of the dam, then in Gaynes Cove by Plummer carpark on 11^th, presumably the same bird; on the latter date there was also a male in the same Tufted Duck flock, though the two Scaup were not really associating.' ID