I have just returned from a few days at the seaside. Balcony view of the Southern Ocean. Off the southern coastline of Victoria, Australia. Port Fairy, to give exact location. My balcony view, perhaps 35 metres from the high tide line, allowed for a close observation of the shoreline. At Dusk, that magical time between sunset and night darkness, the Gulls arrived. Seagulls? The white body grey winged variety, yellow beak, 5 inch legs--common seagulls? They must have been, and yet, they seemed enormous, loomed large in their wheeling and plunging, zooming upwards almost vertically, only to stall at the top and thenwheel away along the waterline horizontally. And mostly in rough formation with other Gulls, but this the exception rather than the rule.
Their flight pattern and display as darkness came on was frenetic. No sound. Bird count? Lets say 60/70 Gulls. Every night at the same time. not before. not after. The same erratic yet repetitive movements. Individually playing as a different instrument in a combined orchestra. Was this showing off? certainly not to Humans. To themselves as a kind of Power Play? ( see how swift and strong I am ). Were they all male Gulls.? I don't know. But My money is/was on them being male Gulls.
Now, this was the first time I have witnessed this phenomenon. My curiosity leads me to ask other members of the Forum for any similar observations in other places on shorelines at Dusk. I'll leave it at that for the moment. westwind.