There once was an ugly duckling
With feathers all stubby and brown
And the other birds said in so many words
Get out of town
Get out, get out, get out of town
And he went with a quack and a waddle and a quack
In a flurry of eiderdown
- 'The Ugly Duckling' Danny Kaye

The cygnets were hatching! I think the one on the left had jsut emerged, no sign of the other eggs moving however. I'll have a look tomorrow. Mama swan is rightly proud - Papa was swimming about close by. I could have stayed there for much longer but was on my lunch break :/