Birding By Impression: A Book Review
10,000 Birds
MAY 5, 2015
GISS—general impression, size, shape—is intuitive, the result of an unconscious cognitive process derived from experience in the field. Experienced birders can identify birds using GISS; all birders can identify birds if they adopt the BBI approach. There is GISS and there is Birding by Impression and they are not the same.
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