Sproghawk

On the way home last night I saw a flock of 50 or so Starlings wheeling over the houses - what attracted me to them was the fact that they had formed such a tight dense flock. Scanning round I saw a Sparrowhawk soaring close by and it was obvious that the Starlings had tightened up their flock in the presence of the hawk a bit like the cowboys grouping the coaches tighter together when the indians appeared on the horizon.