The purpose of this book is the same as the books previously published, namely to direct nature lovers and today's young people to approach in a direct way and study the wonderful world of nature.In this Fourth part, preparation of a ringed teal, I consider that the readers have already bought at least the first part, the volume one, in fact I will not dwell on the parts of the laboratory, description of the fake eyes, attitudes and anatomical studies.In the end I will describe, as in the other books, the chemical form.This e-book, in addition to the written part, contains about sixty-four minutes of footage distributed in nineteen movies.Please note: there may be grammatical errors due to my poor command of foreign languages (original language: Italian).