No interactions present.
If it is the Ruddy Duck you are very fortunate to see it. Those in our area he all 'disappeared'. We use to watch them on the River Stour at Stourwood , Wrabness, Essex. It was always amusing to watch them asleep, with heads tucked in drifting on the tide resembling curling stones revolving slowly as they passed by. Unfortunately they were destroyed as was the hide - vandalism. Why ???
Ruddy Ducks are native to N America with our population stemming from escapees, mostly from the WWT’s collection at Slimbridge (http://blx1.bto.org/birdfacts/results/bob2250.htm). Unfortunately they readily hybridise with european species, in particular the closely related White-headed Duck Oxyura leucocephala; to counter this they are notifiable and there is a culling programme in place.
I am not commenting on the rights or wrongs of this as a strategy.
The left hand bird looks like a male Tufted Duck to me. The right hand bird may be a female of this species - but it's a bit difficult to be sure of anything.
Alan Brampton (Benson)
... they are probably not Ruddy Ducks. As you say Alan the LH bird looks very much like a Tufted but I wouldn’t like to commit to anything for the other one.
Lat/Lng: 51.2, 0.1
OS grid ref: TQ5256