I searched for a textbook on ornithology that I could use in association with the Bird Biology Home Study Course that I was planning to take through Cornell University. I found the textbook at Amazon.com. The information in this textbook is absolutely wonderful! Frank Gill presents an "encyclopedia" of information in an easy-to-read, comprehensible format. Anyone interested in the serious study of bird biology will want to add this textbook to his or her bookshelf. Within the next few months, I will reread this textbook again. How many textbook readers can honestly state that they would reread any textbook in its entirety? Every chapter intrigued and delighted me. I will be actively searching for more books by Frank Gill, based upon the presentation of materials in Ornithology, 2nd edition.