https://www.jstor.org/stable/4083149

On Fri, Dec 1, 2023 at 7:14 AM Nelson Briefer <nreiferb at gmail.com> wrote:


> Years ago in a publication by Smithsonian, was an article by a scientist,

> I believe his name was, last name Evans. The method used was the method

> used by hawk watchers. Using shape and proportions, and wing beats, the

> identification of some birds can be afforded as they pass in front of the

> moon. This method can also be used when the sun is well below the horizon

> and the sky is dark and a raptor passes overhead at close range. In other

> words, color and pattern, are just the skin of the bird, not the meat of

> the bird. Nelson Briefer, Anacortes.

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