DescriptionBritannica Lyre-bird Exterior Feathers.png	English: Drawing showing the exterior two feathers of the lyre-bird's array.
Date	1911
Source	Encyclopaedia Britannica (11th ed.), p. 180
Author	Unknown authorUnknown author
Permission (Reusing this file)	Public domainPublic domainfalsefalse This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

The two exterior feathers (fig. 1, a, b) have the outer web very narrow, the inner very broad, and they curve at first outwards, then somewhat inwards, and near the tip outwards again, bending round forwards so as to present a lyre-like form. But this is not all; their broad inner web, which is of a lively chestnut colour, is apparently notched at regular intervals by spaces that, according to the angle at which they are viewed, seem either black or transparent; and this effect is, on examination, found to be due to the barbs at those spaces being destitute of barbules.