[birding] Re: Airlie CBC Rough-legged Hawks, Winter Wrens, G-c Kinglets, and bluebirds

[Joel Geier]

Hi again,

To add some context to the raw numbers that I posted yesterday, here are
some statistics based on the preceding 10 years of the Airlie CBC:

                     Golden-
           Winter    crowned  Western
           Wren      Kinglet  Bluebird
Mean        112        846        98
Std. dev.    64        534        56
Minimum      18        158        25
Maximum     203       1854       163
THIS YEAR    51        293       126

So this year's count is below average, by about one standard deviation,
for both Winter Wrens and Golden-crowned Kinglets, but well above the
minimum in both cases. Bluebird numbers were above average, but well
within the normal range of variation.

I didn't work up the statistics for Rough-legged Hawk, but this year's
total of 18 compares with previous high counts of 13 (found in two
different years). We might make it 17, since I suspect that one of the
Rough-legged Hawks that Martha and I counted might have also been
counted for an adjoining sector (Adair Village).

Happy birding,
Joel