19 eggs at true relative size, from the 26.6 mm egg of the Northern Pygmy-Owl to the 57 mm egg of the Snowy Owl.
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.
Barn Owl
Tyto alba
- 43.1 × 33 mm
- Clutch: 2–18 eggs
Dull white, often dirtied by the nest.
Sources of information
- Size
- Average of 59 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 142.
Agrees with: Cornell Lab of Ornithology, All About Birds: Barn Owl, Life History. - Description
- Cornell Lab of Ornithology, All About Birds: Barn Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Barred Owl
Strix varia
- 49.5 × 41.5 mm
- Clutch: 1–5 eggs
Pure white, with a rough surface.
Sources of information
- Size
- Cornell Lab of Ornithology, All About Birds: Barred Owl, Life History.
- Description
- Cornell Lab of Ornithology, All About Birds: Barred Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Boreal Owl
Aegolius funereus
- 32.3 × 26.9 mm
- Clutch: 2–9 eggs
Dull white.
Sources of information
- Size
- Average of 47 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 222.
Agrees with: Cornell Lab of Ornithology, All About Birds: Boreal Owl, Life History. - Description
- Cornell Lab of Ornithology, All About Birds: Boreal Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Burrowing Owl
Athene cunicularia
- 31 × 25.5 mm
- Clutch: 2–12 eggs
Smooth and white.
Sources of information
- Size
- Average of 214 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 387.
Agrees with: Cornell Lab of Ornithology, All About Birds: Burrowing Owl, Life History. - Description
- Cornell Lab of Ornithology, All About Birds: Burrowing Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Eastern Screech-Owl
Megascops asio
- 35.5 × 30 mm
- Clutch: 2–6 eggs
White.
Sources of information
- Size
- Average of 56 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 246.
Agrees with: Cornell Lab of Ornithology, All About Birds: Eastern Screech-Owl, Life History. - Description
- Cornell Lab of Ornithology, All About Birds: Eastern Screech-Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Elf Owl
Micrathene whitneyi
- 26.8 × 23.2 mm
- Clutch: 1–5 eggs
White.
Sources of information
- Size
- Average of 50 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 441.
- Description
- Cornell Lab of Ornithology, All About Birds: Elf Owl, 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).
Ferruginous Pygmy-Owl
Glaucidium brasilianum
- 28.5 × 23.2 mm
- Clutch: 2–7 eggs
White, without markings.
Sources of information
- Size
- Average of 50 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 436.
Agrees with: Cornell Lab of Ornithology, All About Birds: Ferruginous Pygmy-Owl, Life History. - Description
- Cornell Lab of Ornithology, All About Birds: Ferruginous Pygmy-Owl, 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).
Flammulated Owl
Psiloscops flammeolus
- 29.1 × 25.5 mm
- Clutch: 2–3 eggs
White with faint creamy tint.
Sources of information
- Size
- Average of 38 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 292.
Agrees with: Cornell Lab of Ornithology, All About Birds: Flammulated Owl, Life History. - Description
- Cornell Lab of Ornithology, All About Birds: Flammulated Owl, 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).
Great Gray Owl
Strix nebulosa
- 53.5 × 42.5 mm
- Clutch: 2–5 eggs
Dull white and unmarked.
Sources of information
- Size
- Cornell Lab of Ornithology, All About Birds: Great Gray Owl, Life History.
- Description
- Cornell Lab of Ornithology, All About Birds: Great Gray Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Great Horned Owl
Bubo virginianus
- 56.1 × 47 mm
- Clutch: 1–4 eggs
Dull white and nearly spherical, with a rough surface.
Sources of information
- Size
- Average of 53 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 302.
- Description
- Cornell Lab of Ornithology, All About Birds: Great Horned Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Long-eared Owl
Asio otus
- 40 × 32.5 mm
- Clutch: 2–10 eggs
White.
Sources of information
- Size
- Average of 103 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 158.
Agrees with: Cornell Lab of Ornithology, All About Birds: Long-eared Owl, Life History. - Description
- Cornell Lab of Ornithology, All About Birds: Long-eared Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Northern Hawk Owl
Surnia ulula
- 40.1 × 31.9 mm
- Clutch: 3–13 eggs
White.
Sources of information
- Size
- Average of 51 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 378.
- Description
- Cornell Lab of Ornithology, All About Birds: Northern Hawk Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Northern Pygmy-Owl
Glaucidium gnoma
- 26.6 × 23.2 mm
- Clutch: 2–7 eggs
White and glossy.
Sources of information
- Size
- Average of 21 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 402.
Agrees with: Cornell Lab of Ornithology, All About Birds: Northern Pygmy-Owl, Life History. - Description
- Cornell Lab of Ornithology, All About Birds: Northern Pygmy-Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Northern Saw-whet Owl
Aegolius acadicus
- 30.5 × 25 mm
- Clutch: 4–7 eggs
White and smooth.
Sources of information
- Size
- Cornell Lab of Ornithology, All About Birds: Northern Saw-whet Owl, Life History.
- Description
- Cornell Lab of Ornithology, All About Birds: Northern Saw-whet Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Short-eared Owl
Asio flammeus
- 39 × 31 mm
- Clutch: 1–11 eggs
Cream/white, becoming darker with age and stained from nest debris.
Sources of information
- Size
- Average of 56 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 172.
Agrees with: Cornell Lab of Ornithology, All About Birds: Short-eared Owl, Life History. - Description
- Cornell Lab of Ornithology, All About Birds: Short-eared Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Snowy Owl
Bubo scandiacus
- 57 × 45 mm
- Clutch: 3–11 eggs
White.
Sources of information
- Size
- Cornell Lab of Ornithology, All About Birds: Snowy Owl, Life History.
- Description
- Cornell Lab of Ornithology, All About Birds: Snowy Owl, 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).
Make a 3D-printable copy of this egg →See posters with this egg →
Spotted Owl
Strix occidentalis
- 51.5 × 44 mm
- Clutch: 1–4 eggs
White to pearl gray.
Sources of information
- Size
- Cornell Lab of Ornithology, All About Birds: Spotted Owl, Life History.
- Description
- Cornell Lab of Ornithology, All About Birds: Spotted Owl, 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).
Western Screech-Owl
Megascops kennicottii
- 34.8 × 29.9 mm
- Clutch: 2–7 eggs
White.
Sources of information
- Size
- Average of 45 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 267.
Agrees with: Cornell Lab of Ornithology, All About Birds: Western Screech-Owl, Life History. - Description
- Cornell Lab of Ornithology, All About Birds: Western Screech-Owl, 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).
Whiskered Screech-Owl
Megascops trichopsis
- 33 × 27.6 mm
- Clutch: 2–4 eggs
Creamy white with fine spots.
Sources of information
- Size
- Average of 13 eggs: Bent, Life Histories of North American Birds of Prey, Part 2 (U.S. National Museum Bulletin 170, 1938), p. 288.
- Description
- Cornell Lab of Ornithology, All About Birds: Whiskered Screech-Owl, 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).