The tilting swan

Update on the swan saga: The swan was there again today! But this time in the other end of the lake and in the same position as yesterday, enjoying his breakfast. I guess at commenting the same thing, but the next day requires a new expression... The swan was tilted downwards under the surface? But I'm sure it was the same swan! I could recognise the way he enthusiasticly waved his left ....erhm..foot? Flipper...Flopper -what do you call the foot of a swan?? Anyway, when you see the same creature several times, then its customary to name it. So if I see the upturned guy tomorrow again, then his name will become "Nelson". But if he is not showing his bottom, then I will surely not recognise him...hmmmm