Murmuration

A regular evening sighting on Brighton seafront is this kind of murmuration of starlings. They seem to have been a bit put out by the decline of the West Pier, and now peripatetically appear in various places along the beach.

The foreground is seen at extreme low tides, usually just a couple of times per year. It's the remains of the first pier in Brighton, the Royal Suspension Chain Pier, sticking up through the sand (yes, sand!) just down from New Steine.

en.wikipedia.org/wiki/The_Royal_Suspension_Chain_Pier