White-naped Brushfinch Egg (Atlapetes albinucha): Size, Colour & Sources

Atlapetes albinucha

Breeds in Mexico, Central America (6 countries) and South America (2 countries)

show all 9

Mexico: Mexico
Central America: Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
South America: Colombia, Ecuador

Pure white or faintly tinged blue, usually unmarked.

Size: Average of 9 eggs: Skutch, A. F. 1967. Life Histories of Central American Highland Birds. Publications of the Nuttall Ornithological Club 7. Cambridge, Mass., Yellow-throated Brush-Finch account, 'The Eggs' (scan leaf ~208; account begins p. 196 per contents).
Agrees with: Cherrie, G. K. 1892. A preliminary list of the birds of San José, Costa Rica (continued). The Auk 9(1): 21-27. [as Buarremon gutturalis; 4 eggs from 2 nests, San José: .90 x .67, .88 x .64, .95 x .68, .96 x .68 in (first pair printed breadth-first) = mean 23.4 x 17.0 mm, my computation/conversion], pp. 25-26; Ogilvie-Grant, W. R. 1912. Catalogue of the Collection of Birds' Eggs in the British Museum (Natural History), Vol. 5. London: British Museum. [as Atlapetes gutturalis, 'Yellow-throated Sparrow'; 7 eggs, Mexico, Medellín (Colombia) and Costa Rica: range .91-.98 x .67-.72 in = 23.1-24.9 x 17.0-18.3 mm; midpoint 24.0 x 17.7 mm], p. 293.
Description: Skutch 1967, Life Histories of Central American Highland Birds (Publ. Nuttall Orn. Club 7; as Atlapetes gutturalis).
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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