During 1905–10, Dresser brought out his last major book, on the eggs of the birds of Europe. His Russian collaborators were making important discoveries in Central Asia and Siberia, and provided him with many specimens. Dresser publicised these discoveries in the book and in presentations at the Zoological Society of London. The Eggs of the Birds of Europe was illustrated using colour photography of eggs, mostly from Dresser’s collection. It was possibly the first natural history book to be illustrated using colour photography, based on the ‘three-colour process’. There was a further dispute with the British Museum (Natural History) as Dresser acquired some bird skins from an ‘official’ expedition, the British Expedition to Tibet of 1903–04, which the museum’s curators felt should go to the museum.