Identificaciones de birdernerder

In the River Trym, Badock's Wood, Southmead, Bristol

In the forth picture you can see the parent pulling plants up for the signets to feed on critters living on it such as the big snail

They moved onto the swan nest while they were away feeding, I did try and frighten them off before the swans came back but they hopped onto the nest again each time, counted 10 babies

Dead. Potential juvenile or fledgling brought in by cat?