You can see a bird right at the start of the film fly up leftwards for about 5 frames.
If I would hazard a guess its a skylark, though the bird sound at the start sounds more like a gull and not a skylark
They typically hover near stationary about 100m high and appear pretty much like the above video,
[embedded content]best video I could find typically they more stationary than this though in the air, Even in this better wuality video the bird sometimes disappears due to focusing.
FWIW from what I could make out ... Read even more
