books.google.com.au - Birds are among the most extensively studied of all animal groups. Hundreds of academic journals and thousands of scientists are devoted to bird research, while amateur enthusiasts (called birdwatchers or, more commonly, birders) probably number in the millions. Birds are categorised as a biological...https://books.google.com.au/books/about/The_Birds_World.html?id=irOaBQAAQBAJ&utm_source=gb-gplus-shareThe Birds World
I find it "hilarious" that Nicolae Sfetcu names himself as author of this book. It's lifted verbatim from Wikipedia. Save your money and access the continually updated information from the website instead!