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Illustration of a Marsh Antwren (Formicivora acutirostris) egg, 18.3 × 12.8 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Formicivora acutirostris

  • 18.3 × 12.8 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 Brazil

No documented description found yet; drawn like the Northern White-fringed Antwren egg (same genus).

Sources of information

Size
Estimated, no measurements found: the median length and width of measured eggs of the same genus: Formicivora intermedia, Formicivora serrana.
Description
Estimated, no description found: drawn like a related egg (Northern White-fringed Antwren).
Shape
Drawn from the length and width, with the taper estimated from the typical eggs of its group (how these eggs are drawn).

Have you seen this egg, or know a description or measurements of it? Message us.