by W. Crawford · Editors, S.A. · tapa blanda · ISBN 9788445900086
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«Periquitos» is W. Crawford's guide to the color and breeding of budgerigars, published by Editors, S.A. in paperback (148 pages, in Spanish).
The book examines the variety of colors of budgerigars (melopsittacids), from classic green to gray with all intermediate shades, and explains how selective crosses and the laws of inheritance have produced the different variations.
This 1992 edition belongs to the Science category and has ISBN-13 9788445900086.
The work is aimed at bird lovers and breeders interested in selective breeding and color varieties.
