I work in the Design Block at Woodford Aerodrome, recently we have been moved up to the top floor, with a good view of the Airfield. It is inhabitated by a large number of Lapwings (Peewits), I have been watching them for the past few weeks and noticed that they seem to be split into two separate flocks. But, they still seem to behave in the same way, if for example the first bird to land picks the taxiway, then the other 50/60 odd birds follow suit. If however he/she decides to land on the grass by the edge of the taxiway, again they all follow suit. After a while on the dark surface of the runway (heated by the sunshine) they take off and fly up onto the hangar roof, white asbestos boards, I wonder if this is because their feet have been heated by the taxiway surface and go up onto a more reflective surface to cool down. But both flocks tend to stay within 200 yards of each distinct flock, they also all seem to face the same way. A really nice looking bird with distinctive colouring very broad wings and the distinctive tuft on the top of the head.