While out and about this morning at the lakes I managed to see several Tufted Ducks, but also one duck which I could not indentify for sure. The bird was very much smaller in size compared to a Mallard and had a distinctive white mark in front of the bill, and was totally different to the other Tufties around. Can someone please tell me if it is likely to be a Scaup or jsut another female Tuftie?