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15 eggs at true relative size, from the 17.4 mm egg of the Bell's Vireo to the 26.7 mm egg of the Northern Shrike.

About this collection. These eggs cover most of the birds that nest in Canada and the United States, plus a few famous eggs from elsewhere, like the Ostrich and the extinct Elephant Bird. It isn’t every bird in the world yet; we’ll update this note as the collection grows.

Northern Shrike egg, 26.7 × 19.5 mm Loggerhead Shrike egg, 24.2 × 18.7 mm Black-whiskered Vireo egg, 21 × 15.1 mm Yellow-throated Vireo egg, 20.5 × 14.5 mm Red-eyed Vireo egg, 20.3 × 14.5 mm Plumbeous Vireo egg, 20.2 × 14.9 mm Blue-headed Vireo egg, 19.5 × 14.4 mm Cassin's Vireo egg, 19.4 × 14.3 mm Philadelphia Vireo egg, 19.2 × 14 mm Warbling Vireo egg, 19.1 × 14.2 mm White-eyed Vireo egg, 19 × 13.5 mm Gray Vireo egg, 18 × 13.5 mm Hutton's Vireo egg, 18 × 13.2 mm Black-capped Vireo egg, 17.6 × 13.1 mm Bell's Vireo egg, 17.4 × 12.6 mm
All 15 eggs at the same scale, largest first. Tap an egg to jump to it.
Bell's Vireo egg, 17.4 × 12.6 mm
Black-capped Vireo egg, 17.6 × 13.1 mm

Black-capped Vireo

Vireo atricapilla

  • 17.6 × 13.1 mm
  • Clutch: 2–5 eggs

Smooth and white.

Sources of information

Size
Average of 50 eggs: Bent, Life Histories of North American Wagtails, Shrikes, Vireos, and Their Allies (U.S. National Museum Bulletin 197, 1950), p. 224.
Description
Cornell Lab of Ornithology, All About Birds: Black-capped Vireo, 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).
Black-whiskered Vireo egg, 21 × 15.1 mm

Black-whiskered Vireo

Vireo altiloquus

  • 21 × 15.1 mm
  • Clutch: 2–4 eggs

White with a few small brown dots.

Sources of information

Size
Average of 43 eggs: Bent, Life Histories of North American Wagtails, Shrikes, Vireos, and Their Allies (U.S. National Museum Bulletin 197, 1950), p. 318.
Description
Cornell Lab of Ornithology, All About Birds: Black-whiskered Vireo, 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).
Blue-headed Vireo egg, 19.5 × 14.4 mm
Cassin's Vireo egg, 19.4 × 14.3 mm
Gray Vireo egg, 18 × 13.5 mm

Gray Vireo

Vireo vicinior

  • 18 × 13.5 mm
  • Clutch: 2–4 eggs

White with variable amount of small spots.

Sources of information

Size
Average of 31 eggs: Bent, Life Histories of North American Wagtails, Shrikes, Vireos, and Their Allies (U.S. National Museum Bulletin 197, 1950), p. 272.
Description
Cornell Lab of Ornithology, All About Birds: Gray Vireo, 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).
Hutton's Vireo egg, 18 × 13.2 mm
Loggerhead Shrike egg, 24.2 × 18.7 mm
Northern Shrike egg, 26.7 × 19.5 mm

Northern Shrike

Lanius borealis

  • 26.7 × 19.5 mm
  • Clutch: 4–9 eggs

Grayish or greenish white, heavily marked with brown spots and blotches.

Sources of information

Size
Average of 31 eggs: Bent, Life Histories of North American Wagtails, Shrikes, Vireos, and Their Allies (U.S. National Museum Bulletin 197, 1950), p. 115.
Agrees with: Cornell Lab of Ornithology, All About Birds: Northern Shrike, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Northern Shrike, 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).
Philadelphia Vireo egg, 19.2 × 14 mm
Plumbeous Vireo egg, 20.2 × 14.9 mm

Plumbeous Vireo

Vireo plumbeus

  • 20.2 × 14.9 mm
  • Clutch: 3–5 eggs

Creamy white with sparse dark spots around larger end.

Sources of information

Size
Average of 30 eggs: Bent, Life Histories of North American Wagtails, Shrikes, Vireos, and Their Allies (U.S. National Museum Bulletin 197, 1950), p. 311.
Description
Cornell Lab of Ornithology, All About Birds: Plumbeous Vireo, 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).
Red-eyed Vireo egg, 20.3 × 14.5 mm

Red-eyed Vireo

Vireo olivaceus

  • 20.3 × 14.5 mm
  • Clutch: 1–5 eggs

Dull white with sparse, sepia speckling.

Sources of information

Size
Average of 50 eggs: Bent, Life Histories of North American Wagtails, Shrikes, Vireos, and Their Allies (U.S. National Museum Bulletin 197, 1950), p. 337.
Description
Cornell Lab of Ornithology, All About Birds: Red-eyed Vireo, 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).
Warbling Vireo egg, 19.1 × 14.2 mm
White-eyed Vireo egg, 19 × 13.5 mm

White-eyed Vireo

Vireo griseus

  • 19 × 13.5 mm
  • Clutch: 3–5 eggs

White with sparse spotting.

Sources of information

Size
Cornell Lab of Ornithology, All About Birds: White-eyed Vireo, Life History.
Description
Cornell Lab of Ornithology, All About Birds: White-eyed Vireo, 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).
Yellow-throated Vireo egg, 20.5 × 14.5 mm

Yellow-throated Vireo

Vireo flavifrons

  • 20.5 × 14.5 mm
  • Clutch: 3–5 eggs

Creamy white with sparse dark spots around larger end.

Sources of information

Size
Cornell Lab of Ornithology, All About Birds: Yellow-throated Vireo, Life History.
Description
Cornell Lab of Ornithology, All About Birds: Yellow-throated Vireo, 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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