The QR codes are really great, and adds a lot of value to the book. I use them all the time. I belive this book will sell in great numbers for many years to come, and that it will be a reference to many people for decades, so I really hope the links that the QR codes provide will be kept alive “for ever” or at least for a very long time.

This volume was published in 1997. It has an introductory essay "Species Concepts and Species Limits in Ornithology" by Jürgen Haffer. Groups covered in this volume are as follows: This volume was published in 1999. It has an introductory essay "Risk Indicators and Status Assessment in Birds" by Nigel J. Collar. Groups covered in this volume are as follows:Jarvis, E.D.; etal. (2014). "Whole-genome analyses resolve early branches in the tree of life of modern birds". Science. 346 (6215): 1320–1331. Bibcode: 2014Sci...346.1320J. doi: 10.1126/science.1253451. PMC 4405904. PMID 25504713.

As you prepare to view your records in eBird, we strongly recommend that everyone take this short course which introduces eBird and explains how it functions as both a tool for your personal bird records *and* as a scientific endeavor: https://academy.allaboutbirds.org/product/ebird-essentials/ Puan, C.L, Davison, G. & Kim Chye Lim, K. C. 2020. Birds of Malaysia. Lynx and BirdLife International Field Guides Collection. Lynx Edicions, Barcelona. For those of us who can remember that the global bird list stood at around 9,500 species not that long ago, it is staggering to see that there are 11,524 “species” illustrated in this impressive book. I use quotation marks because the actual number of species accepted by the various lists, at the time of publication, varied from 10,033 in Howard and Moore (as of August 2018), 10,563 in eBird/Clements (August 2019), 10,783 in IOC (January 2020), to 10,989 in HBW-BirdLife (Dec 2019). As a complement to the Handbook of the Birds of the World and with the ultimate goal of disseminating knowledge about the world's avifauna, in 2002 Lynx Edicions started the Internet Bird Collection (IBC). It is a free-access, but not free-licensed, on-line audiovisual library [3] of the world's birds with the aim of posting videos, photos and sound recordings showing a variety of biological aspects (e.g. subspecies, plumages, feeding, breeding, etc.) for every species. It is a non-profit endeavour fuelled by material from more than one hundred contributors from around the world.

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Davison, G.W.H., Collar, N.J., Boesman, P. & Puan, C.L. 2020. Species rank for Rheinardia ocellata nigrescens (Phasianidae). Bull. Brit. Orn. Cl. 2020 140: 182-194. This volume was published in 2003. It has an introductory essay "A Brief History of Classifying Birds" by Murray Bruce. Groups covered in this volume are as follows:

The passerines (perching birds) alone account for well over 5,000 species. In total there are about 10,000 species of birds described worldwide, though one estimate of the real number places it at almost twice that. [1] Common bird names available in more than 55 languages as well as 38 regional versions of English, Spanish, French, and Portuguese. Content remains in English.

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Though we closely collaborate, these are three stand-alone programs at the Cornell Lab. Birds of the World is not a listing program, but an online content subscription service. eBird is a listing/data collection tool, and Macaulay Library is a wildlife media collection (much of the Internet Bird Collection was merged into Macaulay). Contributing media/data to eBird and the Macaulay Library is free, and will always be free! All these programs have reciprocal benefits and the experience of one is enhanced by experience with the other.

Stevenson, T. & Fanshawe, J. Birds of East Africa: Kenya, Tanzania, Uganda, Rwanda, Burundi. 2nd Edition (2020). Helm Field Guides, Christopher Helm, London. Bloomsbury. Material in each volume is grouped first by family, with an introductory article on each family; this is followed by individual species accounts (taxonomy, subspecies and distribution, descriptive notes, habitat, food and feeding, breeding, movements, status and conservation, bibliography). In addition, all volumes except the first and second contain an essay on a particular ornithological theme. More than 200 renowned specialists and 35 illustrators (including Toni Llobet, Hilary Burn, Chris Rose and H. Douglas Pratt) from more than 40 countries have contributed to the project up to now, as well as 834 photographers from all over the world. Rasmussen, P.C., Ericson P.G.P., Yanhua Qu, Irestedt, M., Blom, M., Sullivan, P, Lambert, F.R. & Rheindt, F.E. 2020. Unexpected plumage congruence with DNA and song evidence for species groups in the Hooded Pitta Pitta sordida complex. North American Ornithological Conference. Poster presentation.As these programs become even more tightly integrated with eBird and the Macaulay Library, creating the ultimate tool for record keeping, observation data, and media, all underpinned by unparalleled life history information on birds. Nearly all living birds belong to the subclass Neognathae or "new jaws". With their keeled sternum (breastbone), unlike the ratites, they are known as carinatae. Birds of the World relies on the integration of three core pillars: scholarly content (Birds of the World), bird observations (eBird), and multimedia (Macaulay Library). Learn more about this source content here. Etymology of scientific bird names from James A. Jobling’s book, “Dictionary of scientific bird names” – released 2020