I've always had a problem with lots of the very precise seeming
numbers you get in things like Christmas Counts, Project Feederwatch, etc.
I've been on Christmas Counts where we've seen a big flock of, say,
starlings and decided that there were about 250 birds in the flock. A
little later we'd pass another somewhat smaller starling flock and say that
it had about a hundred birds in it. A little later we'll see something
between 20 and 30 starlings flying, and call it 25. Soon afterwards we'll
see 12 starlings sitting on a wire, and later we'll count 7 at a feeder, and
two more on the ground. How many starlings did we see that day? Why
precisely 396 birds - not 395, and not 397.
There's something wrong here.