File:Wren Egg 16.png

Summary
Wren egg - (Oeuf de troglodyte)

From: Eggs), illustration by Adolphe Millot (1857 - 1921) from Nouveau Larousse Illustré [1897-1904]

Source:Nouveau Larousse Illustré, edited by Claude Augé, published in Paris by Librarie Larousse 1897-1904, this illustration from vol. 6 p. 473