well I guess there are a few less swans in that count now huh?
well I guess there are a few less swans in that count now huh?
"Eventually, all things merge into one, and a river runs through it. The river was cut by the world's great flood and runs over rocks from the basement of time. On some of the rocks are timeless raindrops. Under the rocks are the words, and some of the words are theirs.
I am haunted by waters" Norman Maclean.
If it's like a lot of surveys, you are not trying to count every single duck, just representative transects that you run every year so you can make year to year comparisons. It's not an exact count by any means. Now they may interpolate for other similar habitat to get estimates for larger areas.
They will straight out tell you that the survey doesn't yield a realistic number. They fly the same transects and extrapolate from the number of birds actually counted. The number they come up with is only useful for comparison purposes. Like "last time we saw twice as many mallards, so, now we have a lot less mallards".
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