nesting gulls and crows

Herring gulls that are nesting nearby are collecting nesting materials from the track that runs past our house. 

There are at least two, possibly three different gulls that fly off in different directions with their nesting materials.

Some collect the twigs and similar debris, while one in particular has been actually pulling up grass and moss. The key seems to be to collect as much as they can.

There is the inevitable squabble with a pair of crows who are also collecting nesting materials.

However, unlike the herring gulls, they seem to be a lot more choosy with the materials they gather. possibly because a crows nest is a more substantial affair - the seagulls is just a pile of debris to cushion the eggs and stop them rolling away.