Attack, attack!

There is a new young swan family with two cygnets on the Relief Channel who have been battling to make a space for themselves. Hopefully they will settle. Meanwhile the Swans with the five cygnets further up towards the sluice are doing fine, no one bothers them. 
Extras.Over on the tidal river a heron is being watched enviously by a gull while it tackles a crab. As you can see by the bulge in its neck in the final extra it manages to get it down, eventually.