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Eggs

Illustration of a Mute Swan (Cygnus olor) egg, 114.5 × 73.1 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Cygnus olor

  • 114.5 × 73.1 mm
  • Clutch: 2–5 eggs
Breeds in Canada, United States

Blue-green when laid, changing to white and chalky; sometimes stained olive-brown.

Sources of information

Size
Average of 50 eggs: Witherby, H. F. (ed.), Jourdain, F. C. R., Ticehurst, N. F. & Pearson, C. 1920. A practical handbook of British birds, vol. 2 (pts 9-13). London: Witherby, p. 252 (scan leaf 256).
Description
Cornell Lab of Ornithology, All About Birds: Mute Swan, Life History.
Drawing checked against a photo: Bird Eggs of Canada photo (Royal Alberta Museum).
Clutch
Cornell Lab of Ornithology, All About Birds.
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

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