Birds flocking over Blackpool's North Pier at dusk

Back from my Christmas break now with a new set of photos to play with! I took this a couple of days ago in Blackpool. My husband and I walked from his parents' house to the seafront with the dogs and I took my camera 'just in case'. Glad I did, because the light was beautiful as the sun went down. We also got treated to a show from these birds (starlings?) flocking around the pier, creating different patterns of dark waves against the sky.

Camera/lens settings: ISO 400, f/5.6, 1/125s, 48mm, hand held.