Special FeatureNature as seen through Gould's eyesBirds found in JapanThe strange habits of birdsExtinct birds and scarce birdsThe Peak of Perfection in Hand-Coloured Lithography

Of Gould's various works, the works in which birds found in Japan appear most frequently are The Birds of Europe (5 vols., 1832-37) and The Birds of Great Britain (5 vols., 1862-73). Works in which Japanese birds occasionally appear are A Century of Birds from the Himalaya Mountains (1 vol., 1831-32) and The Birds of Asia (7 vols., 1849-83). Works in which they rarely appear are The Birds of Australia (7 vols. & 1 suppl., 1840-69) and The Birds of New Guinea and the adjacent Papuan Islands (5 vols., 1875-88).
The reason why so many birds found in Japan appear in The Birds of Europe and The Birds of Great Britain is because many Japanese birds come from the Eurasian continent. Many migrating birds come to Japan from the continent, so there are many common species between Japan. The west part of Eurasia is Europe, and many birds in Britain come from the European continent. Thus many Japanese birds can also be seen in Britain. However, although there are many common species, the colour of their feathers are not necessarily the same.
If we take a sparrow from Hokkaido and another from Okinawa and compare the colour of their heads, we will discover that their colours differ considerably. However if we examine specimens starting from Hokkaido, then the northern part of Honshu, then the Kanto region, then Kyushu, then the Southern Islands, we would find that the colours of sparrows' heads gradually and continuously change from north to south, and consequently would feel no such incongruity. In the same way, if we compare the sparrows found in Japan with those from Britain, we would feel that the features differ a little, but that they are sparrows just the same. If we examine Gould's works from this viewpoint, we can find many Japanese birds in his illustrations.