Lambrecht said they went low over the first island - McKean - and quickly decided that was wayyyy too low, due to the clouds of birds that rose up and swirled around the strange bi-winged invaders that they had never encountered before. Subsequent overflights were made at 400 feet, as I recall, to avoid hitting one or more of the featherballs.
LTM, who tries to avoid fur and featherballs,
Monty Fowler, TIGHAR No. 2189 ECSP