Things flying over the garden and identified by sound

[janewilliams20]

Well, initially identified by sound, anyway, then confirmed by sight.

Last Sunday it was Buzzards - three of them wheeling overhead and mewing at each other.

A few days back, a sound that I knew I ought to know, but was in the wrong context - I looked out the window to see Oystercatchers flying past. An even more extreme case of "WTF are they doing here???"

Today it was the unmistakable sound of a Merlin. Unmistakable? Well, not so much if you're thinking of the UK's smallest brd of prey, and the sound you can hear on the RSPB page on the subject
 This was a slightly larger and noisier flying object, though still a classic British predator, and the "Merlin" in question was made by Rolls Royce.
http://www.youtube.com/watch?v=ALe8zKWf3uA
The Shuttleworth collection is just under 3 miles from my house, and there was an air display this afternoon