Swarm behaviour, or swarming, is a collective behaviour exhibited by entities, particularly animals, of similar size which aggregate together, perhaps milling about the same spot moving en masse or migrating in some direction. A flock auklets exhibit motion large number of self-propelled. Animal flying bird herd dance rhythm tempo play music art folklore sea lake lagoon shallow beach coast seaside shore seashore seaboard murmuration crowded crowd multitudinous cramped hard pressed jammed thronged populous congested rush eyre hour in droves heron wild wildlife real waterbirds starling ocean tropical belly infestation invasion symmetric symmetry game sky small entertainment fun enjoy dozens hundreds thousands millions birds waterfowl water fowl rhythmical nature natural flocks Cinematic 4K UHD 3840×2160.