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Re: Crows, crows, crows

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Thu, 20 Feb 2003 21:15:10 -0500

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 ```Dana, That is fascinating! Thank you very much. Now I have another birding skill to practice! Sharon Tierra, Brookline Windham County Dana Rohleder wrote: > Sharon. > > You basically have to train yourself. The way I did it was counting > waterfowl, probably the easiest because they sit fairly still. If you are > looking at a small group of birds, say under 20, count them. If you see > another group, guess how many are there, then count them and see how close > you were. Every time you see a small group of anything, guess the size, > count, then adjust your mental picture of 20 items. Eventually, you will get > pretty good at estimating groups of 10, then 20. If you are looking at a > larger group, try to figure how many sets of 20 are in it, then cont them > and check for accuracy. Do this for a while until you are fairly good at > estimating 50. Then when you see a larger group, guess how many groups of 50 > are in it. Then work on estimating 100. Once you get 100 down, you can > handle most any flocks you will find by estimating the number of groups of > 100 within the flock. When counting Snow Geese, good luck!! What I usually > do is estimate an area that contains about 100 birds, then extrapolate that > area over the area of the entire flock, and estimate how many squares and > the area that would contain 1000 birds, then count how many groups of 1000 > are there. > > Everyone has a different ability to estimate numbers - it just takes > practice - and don't be afraid to be wrong. You will almost always be > wrong - the key is to be close and consistent. If you can estimate > consistently within +/- 10%, you will be better than most. > > Dana C. Rohleder, O.D. > Port Kent, NY > <[log in to unmask]> > > ----- Original Message ----- > From: "Sharon Tierra" <[log in to unmask]> > To: <[log in to unmask]> > Sent: Wednesday, February 19, 2003 9:34 PM > Subject: Re: Crows, crows, crows > > > I'm very interested in knowing how one goes about estimating the number > > of birds in an area when numbers are large. > > > > Sharon Tierra > > Brookline ```