Birding by impression History

1. About the Identification by Impression (Jizz) have speaking from the 50´s. Already, in the famous guide of Peterson, Mounfort and Hollom, its existence was signing up. Was known that it skill that the expert ornithologists were possessing, acquired in an empirical way after years of practice, was without comprising well the causes of the phenomenon and, much less, planning a method for its acquisition. 2. In the 90´s, Hume, R. published “Birds by character”, an identification Guide by impression, whith illustrations including behavior and estructure. The ilustrator was Wallace, I., current director of the british RSPB. It is a delightful bird guide but its functioning is like the common guides, comparing illustrations with wild birds, in this case also with illustrations of its structure and behavior. On having acted like a Guide, it does not present a structured and systematical method to operate variables with evaluative language, the way to generate impressions. ...