Wild at Hull: Tophill Low ducktastic

As it is becoming routine, much to my pleasure, the forecast poor weather with heavy rain failed to materialise, and there was just a very brief shower during my visit to the north side of Tophill Low this morning.
A large flock of Chaffinches were feeding around the car park with Collared Doves, and a Great Spotted Woodpecker drummed.
The D reservoir was teeming with ducks: Wigeon, Tufted ducks, Pochard, Goldeneye, Gadwall, a sprinkle of Teal, two Shelduck and a pair of Mallard that looked out of place.
There was a strange and fascinating spectacle going on by the dozen feeding Mute swans, clouds of ducks (mainly Wigeon and Gadwall as far as I could see) and coot surrounded each pair of swans like flies. The ducks and coot were very busy feeding, so I presume the swans were disturbing or releasing something (seeds? invertebrates?) which the ducks seem to enjoy.
Here is a short clip:

In D woods the feeders were busy too: Goldfinches, a Greenfinch, Chaffinch, Blue, Great, Coal and Marsh tit, and Blackbirds and Dunnock underneath.
I spend half an hour in North Marsh hoping for an otter encounter. The highlight is a Kingfisher flying away as I open the window, but other than a pair of Moorhens and a Wren on the reeds, there is little else.
No sign of Barn Owls on the scrub either, but as I walk towards the hide on Helmpholme meadows, two Roe Deer cross the path in front of me, just 10 m away. In the flooded meadows, a pair of Mute Swans resting contentedly, a pair of Mallard and Teal. A Kestrel hovers in the distance, and a large flock of Teal fly overhead.