I know this sounds crazy, must be a coincidence,
This morning there was a skein of geese flying over, I was watching as the formation was changing, heading NW.
They suddenly started to veer round to SW, high above was an aeroplane, heading SW, they continued SW out of sight over the hill, in direct line of the aeroplane .
As I said, sounds crazy, but could they have seen the aeroplane and followed it?
Just seemed odd to see.