This from a report on the internet: The Identification of North American Accipiters.
Seventy man- years of watching and trapping distilled herewith : How to, and how not to, identify accipiters. Helmet C. Mueller, Daniel D. Berger and George Allez.
This you will not find in this article: Wing shape, wing holding, and wing movement. In other words, the article is about a dead specimen or a live, hand held bird. The authors do write of the mechanics of wing speed compared to wing structure and wing length. I say, wing speed can vary, depending on many factors. However, wing speed is only a small part of wing action.
The take-away: A very interesting, informative article. It will open the eyes of many birders. However, this article, scientific paper, is not about hawk watching. NB.
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