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Illustration of a Black-capped Siskin (Spinus atriceps) egg, 16.9 × 12.4 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Spinus atriceps

  • 16.9 × 12.4 mm (estimated)
  • Speculative: we haven't found a documented description of this egg yet, so we estimated its colours and markings and its size from related birds.
Breeds in Mexico, Guatemala

No documented description found yet; presumed pale greenish blue with a few dark brown spots at the larger end, as in Pine Siskin.

Sources of information

Size
Estimated, no measurements found: the median length and width of measured eggs of the same genus: Spinus atratus, Spinus barbatus, Spinus crassirostris, Spinus cucullatus, Spinus dominicensis ….
Description
Agrees with: Wikipedia, 'Black-capped siskin' (citing Clement 2020, Birds of the World): nothing known of breeding biology.
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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