Written by the authors of Whose Bird, but greatly expanded to list both scientific as well as vernacular birds’ names, the Dictionary has over 4,100 entries and covers more than 10,000 genera, species and subspecies. It provides brief details of the eponymous names – including steel magnates and princes along with the explorers, scientists and ornithologists – from Aagaard (the Buffy Fish Owl, Ketupa ketupa aagaardi) to Zusi (Bogota Surnangel, Helioangelus zusii).