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Eggs

Illustration of a Brown Jay (Cyanocorax morio) egg, 34.4 × 24.3 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Cyanocorax morio

  • 34.4 × 24.3 mm
  • Clutch: 2–5 eggs
Breeds in United States, Mexico, Belize, Costa Rica, Guatemala, Honduras, Nicaragua, Panama

Blue-grey (fresh eggs, per Skutch) or creamy-white (museum eggs), densely and finely freckled with brown and grey.

Sources of information

Size
Average of 4 eggs: Ogilvie-Grant, W. R. 1912. Catalogue of the Collection of Birds' Eggs in the British Museum (Natural History), Vol. 5. London: British Museum (Natural History), pp. 502-503.
Description
Skutch, A. F. 1935. Helpers at the nest. Auk 52: 257-273, p. 262.
Agrees with: Ogilvie-Grant, W. R. 1912. Catalogue of the Collection of Birds' Eggs in the British Museum (Natural History), Vol. 5, pp. 502-503; Lawton, M. F. & R. O. Lawton. 1985. The breeding biology of the Brown Jay in Monteverde, Costa Rica. Condor 87: 192-204, p. 198.
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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