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Illustration of a Seaside Sparrow (Ammospiza maritima) egg, 20.9 × 15.5 mm
Illustration © 2026 Lincoln Savi, Savi Made. Free to use with credit.

Ammospiza maritima

  • 20.9 × 15.5 mm
  • Clutch: 2–5 eggs
Breeds in United States, Mexico

Bluish white to grayish white, speckled and blotched with shades of brown, often more heavily on larger end.

Sources of information

Size
Average of 50 eggs: Bent, Life Histories of North American Cardinals, Grosbeaks, Buntings, Towhees, Finches, Sparrows, and Allies (U.S. National Museum Bulletin 237, Part 2, 1968), p. 822.
Description
Cornell Lab of Ornithology, All About Birds: Seaside Sparrow, Life History.
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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