Birds That Lay Blue Eggs: 26 Species, Identification Guide, and Photos
Bird eggs come in an amazing range of colors, but blue is one of the most striking. From the iconic robin's-egg blue to deep turquoise and blue-green shades, these eggs are both beautiful and biologically fascinating.
A surprising number of birds lay blue or blue-green eggs, including robins, bluebirds, starlings, thrushes, blackbirds, herons, and even emus. In this guide, we’ll look at 26 birds that lay blue eggs, along with egg color, size, clutch details, nesting habits, and identification tips.
Quick Answer
Some of the best-known birds that lay blue eggs include the American Robin, Eastern Bluebird, European Starling, Dunnock, Song Thrush, Gray Catbird, and Red-winged Blackbird. Their eggs range from plain sky blue to turquoise or blue-green with speckles and blotches.
Why Do Some Birds Lay Blue Eggs
Bird egg color comes mainly from two pigments deposited in the shell during formation:
- Biliverdin produces blue, turquoise, and green shades.
- Protoporphyrin produces reddish-brown tones, spots, and speckles.
- When a female deposits more biliverdin into the shell, the egg appears blue or blue-green.
Researchers have proposed several possible functions for blue egg coloration, and the importance of each likely varies by species. These may include:
- Camouflage, especially when eggs are speckled and laid in open nests.
- Temperature regulation, since lighter or reflective eggs may respond differently to sunlight.
- Signaling female condition, as in some species, more intensely colored eggs may be associated with higher maternal quality and increased male parental investment.
In many birds, egg color is likely shaped by a combination of evolutionary pressures rather than one single cause.
Blue Bird Egg Identification Chart
Use this chart to quickly compare species by egg color, size, clutch size, and incubation period.
| Bird Species | Egg Color | Size (inches) | Clutch | Incubation |
|---|---|---|---|---|
| American Robin | Sky blue (robin's-egg blue), no markings | 1.1 × 0.8 | 3–5 | 12–14 days |
| Eastern Bluebird | Pale blue, occasionally white | 0.8 × 0.6 | 3–7 | 13–16 days |
| Western Bluebird | Pale sky blue, occasionally white | 0.8 × 0.6 | 4–6 | 13–14 days |
| Mountain Bluebird | Pale blue to white | 0.8 × 0.6 | 4–8 | 13–14 days |
| European Starling | Glossy pale blue to white | 1.2 × 0.8 | 4–6 | 11–13 days |
| Dunnock | Vivid turquoise blue, unmarked | 0.8 × 0.6 | 3–5 | 12–13 days |
| European Robin | Pale blue/white with rusty speckles | 0.8 × 0.6 | 4–6 | 13–14 days |
| Song Thrush | Bright blue with black spots | 1.1 × 0.8 | 3–5 | 13–14 days |
| Red-winged Blackbird | Pale blue-green, brown/black scrawls | 1.0 × 0.7 | 3–5 | 11–13 days |
| Blue Jay | Olive or blue-green with brown spots | 1.1 × 0.8 | 3–6 | 16–18 days |
| Eurasian Jackdaw | Pale blue-green with dark speckles | 1.3 × 0.9 | 4–6 | 17–18 days |
| Eurasian Magpie | Blue-green with brown mottling | 1.3 × 0.9 | 5–8 | 21–22 days |
| Common Linnet | Pale blue with reddish-brown spots | 0.7 × 0.5 | 4–6 | 10–14 days |
| American Goldfinch | Pale bluish white, faint spots | 0.6 × 0.5 | 4–6 | 12–14 days |
| House Finch | Pale blue-green, fine dark speckles | 0.7 × 0.5 | 3–6 | 13–14 days |
| Blue-gray Gnatcatcher | Pale blue with reddish-brown spots | 0.6 × 0.5 | 3–5 | 11–15 days |
| Gray Catbird | Deep turquoise green, unmarked | 0.9 × 0.7 | 3–5 | 12–13 days |
| Northern Mockingbird | Blue to green with brown blotches | 1.0 × 0.7 | 3–5 | 11–13 days |
| Snowy Egret | Pale blue-green, unmarked | 1.8 × 1.3 | 3–4 | 24–25 days |
| Great Blue Heron | Pale blue, unmarked | 2.5 × 1.7 | 3–5 | 27–28 days |
| Little Blue Heron | Pale blue-green, unmarked | 1.7 × 1.3 | 3–5 | 22–23 days |
| Blue-footed Booby | Pale blue, chalky texture | 2.7 × 1.8 | 1–3 | 41–45 days |
| Emu | Dark emerald green to blue-black, rough | 5.0 × 3.5 | 7–10 | 56 days |
| Black Tinamou | Glossy teal-green | 2.0 × 1.5 | 4–8 | 16–18 days |
| Common Myna | Blue-green with faint speckles | 1.1 × 0.8 | 4–6 | 13–14 days |
| Blue Finch | Pale blue, unmarked | 0.6 × 0.5 | 3–4 | 12–13 days |
26 Birds That Lay Blue Eggs: Full Species Profiles
North American Species
If you're wondering what bird lays blue eggs, below are 26 birds with blue eggs with notes on their typical egg appearance and nesting habits to help with identification.
American Robin (Turdus migratorius)
The American Robin is the classic source of robin's-egg blue and one of the most recognizable birds in North America. Males have a rich brick-red breast and dark head, while females are slightly paler.
Robins build sturdy cup-shaped nests from mud, grass, and twigs, often in trees, shrubs, ledges, and even house gutters. They may raise two or three broods in a season, so active nests can be found from spring into midsummer.
Eggs: Smooth, unmarked sky blue eggs, about 1.1 × 0.8 inches. Typical clutch size is 3–5 eggs, incubated for 12–14 days.
Eastern Bluebird (Sialia sialis)
The Eastern Bluebird is a small thrush of eastern North America, loved for the male’s bright blue upperparts and warm rusty breast. Females are more muted but still show blue in the wings and tail.
They prefer open country such as orchards, farmland edges, parks, and lightly wooded areas. Eastern Bluebirds are cavity nesters and readily use nest boxes, making them one of the best backyard conservation success stories.
Eggs: Pale blue, occasionally white, smooth and unmarked, about 0.8 × 0.6 inches. Clutch size is 3–7 eggs; the female incubates for 13–16 days.
Western Bluebird (Sialia mexicana)
The Western Bluebird occupies open woodlands, pine-oak forests, and agricultural edges across western North America. Males are richly colored, with deep blue upperparts and a rusty breast; females are mostly gray-brown with touches of blue.
Like other bluebirds, they nest in natural cavities and nest boxes and may compete with starlings and House Sparrows for sites.
Eggs: Pale sky blue, sometimes white, about 0.8 × 0.6 inches. Typical clutch size is 4–6 eggs; incubation lasts 13–14 days.
Mountain Bluebird (Sialia currucoides)
The Mountain Bluebird is the most vividly blue of the North American bluebirds. Males are almost entirely turquoise-blue, while females are more subdued and grayish.
They breed across open grasslands, high plains, and mountain regions of western North America and often hover while hunting insects. They also make good use of nest boxes.
Eggs: Pale blue to nearly white, smooth and unmarked, about 0.8 × 0.6 inches. Clutch size is 4–8 eggs; incubation takes 13–14 days.
American Goldfinch (Spinus tristis)
The American Goldfinch is a common garden bird, especially known for the male’s bright yellow summer plumage and black wings. Unlike many songbirds, goldfinches nest relatively late, often timing breeding with peak summer seed availability.
Their nests are tightly woven cups placed in shrubs or small trees.
Eggs: Pale bluish-white, sometimes with faint brownish markings near the larger end, about 0.6 × 0.5 inches. Clutch size is 4–6 eggs; incubation lasts 12–14 days.
Red-winged Blackbird (Agelaius phoeniceus)
The Red-winged Blackbird is one of the most familiar wetland birds in North America. Males are glossy black with vivid red-and-yellow shoulder patches, while females are heavily streaked brown.
They nest in marshes, ditches, wet meadows, and reedbeds, often in loose colonies. Males are highly territorial and often dive at intruders near the nest.
Eggs: Pale blue-green eggs marked with dark scrawls, streaks, and blotches, usually concentrated near the larger end. Size is about 1.0 × 0.7 inches. Clutch size is 3–5 eggs; incubation lasts 11–13 days.
Blue Jay (Cyanocitta cristata)
Bold, noisy, and intelligent, the Blue Jay is a prominent presence in North American forests and suburbs. Its blue, white, and black plumage is eye-catching, and its raucous calls serve as an alarm system that other woodland species have learned to heed.
Blue Jays are omnivores and important dispersers of acorns — a single bird can carry up to five acorns in its bill and throat pouch. They build substantial, bulky nests of twigs, mud, and plant fibres, usually in the crotch of a tree.
Eggs: Variable in color, often olive, buff, or blue-green with brown spotting. About 1.1 × 0.8 inches. Clutch size is 3–6 eggs; incubation lasts 16–18 days.
Blue-gray Gnatcatcher (Polioptila caerulea)
This tiny insect-eating songbird is active, restless, and often seen flicking its long tail through the treetops. Males show a black forehead line in breeding season; females are plainer.
Males are blue-gray above with a narrow black eyebrow stripe in breeding plumage; females are plainer.
Its nest is a beautifully constructed cup of plant fibers, spider silk, and lichen, carefully camouflaged on a branch.
Eggs: Pale blue with small reddish-brown spots, about 0.6 × 0.5 inches. Clutch size is 3–5 eggs; incubation lasts 11–15 days.
Gray Catbird (Dumetella carolinensis)
Named for its distinctive mewing call, the Gray Catbird is a talented mimic related to the mockingbird. Its uniform slate-gray plumage and chestnut undertail make it easy to identify. It skulks in dense shrubs, thickets, and garden hedges, often heard before it is seen.
Catbirds are energetic, long-distance migrants, wintering in Central America and the Caribbean and returning to North America to breed from May onwards.
Eggs: Deep turquoise-green, smooth and unmarked, about 0.9 × 0.7 inches. Clutch size is 3–5 eggs; incubation lasts 12–13 days. Among North American songbirds, these are some of the deepest blue-green eggs you are likely to see.
Northern Mockingbird (Mimus polyglottos)
The Northern Mockingbird is North America's premier song mimic, capable of replicating dozens of other bird species, insects, and even mechanical sounds within a single performance. Males famously sing at night, particularly under bright moonlight or streetlights.
They are fiercely territorial year-round and defend berry-producing shrubs in winter as private food stores. They build cup nests in shrubs and small trees, often in suburban gardens.
Eggs: Blue to greenish-blue with heavy brown or reddish-brown blotching, about 1.0 × 0.7 inches. Clutch size is 3–5 eggs; incubation lasts 11–13 days.
House Finch (Haemorhous mexicanus)
The House Finch is a highly adaptable songbird now widespread across North America. Males typically show red on the head and breast, while females are streaked brown.
House Finches are highly adaptable and nest in a remarkable variety of locations, including hanging planters, wreaths, and open-fronted buildings. Their sweet, rambling song is a constant presence in suburban gardens.
Eggs: Pale blue-green with fine dark speckles, often concentrated at the larger end. About 0.7 × 0.5 inches. Clutch of 3–6; female incubates for 13–14 days.
European & Asian Species
Dunnock (Prunella modularis)
The Dunnock is a small, modest-looking bird of hedgerows and gardens across Europe and parts of Asia. Though plain in appearance, it is famous among birders for laying some of the most vividly blue eggs of any garden bird.
The Dunnock holds a special place in egg identification because its eggs are among the most vividly blue of any European garden bird — an intense, almost electric turquoise that stands out dramatically from the vegetation.
Eggs: Intense turquoise blue, completely unmarked, about 0.8 × 0.6 inches. Clutch size is 3–5 eggs; the female incubates for 12–13 days.
European Robin (Erithacus rubecula)
The European Robin is one of Britain's most beloved birds, synonymous with Christmas cards and winter gardens. Its orange-red breast is instantly recognisable, though juveniles are spotted brown without any red at all.
Robins hold winter territories independently, and both males and females sing year-round to defend feeding areas.
They nest in a remarkable variety of locations: ivy-covered walls, log piles, open-fronted nest boxes, and occasionally inside garden sheds or upturned plant pots.
Eggs: Usually whitish, buff, or very pale blue with reddish or rusty speckles. About 0.8 × 0.6 inches. Clutch size is 4–6 eggs; incubation lasts 13–14 days.
Song Thrush (Turdus philomelos)
The Song Thrush is one of Britain and Europe's finest songsters, known for its habit of repeating each musical phrase two or three times.
It is a medium-sized thrush with warm brown upperparts and a cream breast covered in dark arrowhead spots. Unlike many birds, Song Thrushes are famous for using a favourite stone, an 'anvil', to smash open snail shells.
Eggs: Bright blue with scattered black or very dark brown spots, about 1.1 × 0.8 inches. Clutch size is 3–5 eggs; incubation lasts 13–14 days.
Song Thrush numbers have declined significantly in many parts of western Europe due to agricultural intensification, making each nesting pair more valuable ecologically.
Eurasian Jackdaw (Corvus monedula)
The Eurasian Jackdaw is the smallest member of the crow family found in Europe. Its black plumage, silvery-grey nape, and pale, intelligent eyes give it a distinctive look.
Jackdaws are highly social birds that mate for life and nest in large, chattering colonies. They are cavity nesters by nature, like chimneys, church towers, cliffs, and old trees all suit them.
Eggs: Pale blue or blue-green with darker speckles and blotches, about 1.3 × 0.9 inches. Clutch size is 4–6 eggs; incubation lasts 17–18 days.
Jackdaws are curious and have demonstrated tool use and problem-solving abilities in laboratory studies, consistent with their placement among the most cognitively advanced birds.
Eurasian Magpie (Pica pica)
The Eurasian Magpie is a striking black-and-white corvid with a long iridescent tail and a reputation for intelligence. It builds a large domed stick nest, usually high in a tree.
Magpies build large, domed stick nests with a side entrance, typically high in a tree where the structure remains visible throughout the year. Pairs often return to the same nest, adding material annually until it becomes enormous.
Eggs: Blue-green with dense brown or olive mottling, about 1.3 × 0.9 inches. Clutch size is 5–8 eggs; incubation lasts 21–22 days.
Common Linnet (Linaria cannabina)
The Common Linnet is a small finch of open farmland, heathland, and scrub across Europe and western Asia.
Breeding males are handsome: crimson forehead and breast, chestnut back, with white-edged wing feathers that create a pale panel in flight. Females and non-breeding males are streaky brown. Linnets are gregarious outside the breeding season and can form flocks of hundreds.
Eggs: Pale blue with reddish-brown or purplish spots and blotches, about 0.7 × 0.5 inches. Clutch size is 4–6 eggs; incubation lasts 10–14 days.
European Starling (Sturnus vulgaris)
The European Starling is an adaptable, gregarious species native to Europe and western Asia, famously introduced to North America in 1890 and now numbering over 200 million there.
In breeding plumage, starlings are iridescent green and purple with a yellow bill; in winter, they are heavily spotted with white. Their murmurations, vast, swirling aerial flocks, are one of nature's great spectacles.
Starlings are cavity nesters and compete vigorously with native cavity-nesting species in North America, which has contributed to declines in some native bird populations.
Eggs: Pale glossy blue, occasionally white or very pale green, completely unmarked. About 1.2 × 0.8 inches. Clutch of 4–6; both parents incubate for 11–13 days.
Wading Birds & Seabirds
Snowy Egret (Egretta thula)
The Snowy Egret is an elegant, medium-sized white heron found across the Americas, from the southern United States through Central and South America.
It is distinguished from the Great Egret by its smaller size, black bill, black legs, and distinctive bright yellow feet — a feature so memorable that the species is sometimes called 'golden slippers'. During the breeding season, it grows elaborate, lacy plume feathers on its back.
Snowy Egrets nest colonially, often alongside other heron and egret species in mixed rookeries in trees or tall shrubs over water.
Eggs: Pale blue-green, smooth, and unmarked. Considerably larger than songbird eggs at approximately 1.8 × 1.3 inches. Clutch of 3–4; both parents incubate for 24–25 days.
Great Blue Heron (Ardea herodias)
The Great Blue Heron is North America's largest heron, standing up to 1.4 metres tall with a wingspan approaching 2 metres.
Despite its size, it moves with slow deliberation, stalking fish and frogs in shallow water before striking with explosive speed. It is a year-round resident across most of North America, often seen perched motionless at the water's edge in the early morning.
Great Blue Herons nest in large colonies called rookeries, building massive stick platforms in the tops of tall trees, sometimes returning to the same nesting site for decades.
Eggs: Pale dull blue, unmarked, with a slightly rough texture. The largest blue eggs on this list are approximately 2.5 × 1.7 inches. Clutch of 3–5; both parents share incubation duties for 27–28 days.
Little Blue Heron (Egretta caerulea)
The Little Blue Heron is a medium-sized heron with striking slate-blue plumage in adults and pure white plumage in juveniles — a difference so dramatic that immature birds were once considered a separate species.
The transition plumage, showing a patchwork of white and blue, is distinctive. They inhabit marshes, swamps, and coastal shallows across the southeastern US and Central America.
Eggs: Pale blue-green, smooth, unmarked. About 1.7 × 1.3 inches. Clutch of 3–5; both parents incubate for 22–23 days in platform nests built in mixed heron/egret colonies.
Blue-footed Booby (Sula nebouxii)
The Blue-footed Booby is a seabird of the eastern Pacific Ocean, most famous for the male's spectacular courtship display in which he high-steps to show off his vivid turquoise-blue feet.
The brighter the blue, the more attractive the male to females, since foot color reflects diet and health. They breed on rocky Pacific islands, including the Galapagos, where they are famously approachable.
Boobies plunge-dive from height to catch fish below the surface, folding their wings and hitting the water at up to 97 km/h. Their nostrils are permanently closed to prevent water from entering during dives.
Eggs: Pale blue with a distinctive chalky, calcium-encrusted texture that becomes stained over the long incubation period. About 2.7 × 1.8 inches. Clutch of 1–3; both parents incubate for 41–45 days.
Specialist & International Species
Emu (Dromaius novaehollandiae)
The Emu is the world's second-largest bird and is endemic to Australia. Standing up to 1.9 metres and weighing up to 60 kg, it cannot fly but is a powerful runner capable of sustaining speeds of 48 km/h.
Emus are nomadic, covering vast distances across Australian scrub, grassland, and forest in search of food and water.
The Emu's reproductive strategy is unusual: the male alone incubates the eggs and raises the chicks, barely eating or drinking during the 8-week incubation. He loses around a third of his body weight in the process.
Eggs: Very large, dark emerald green to blue-black, with a rough, textured surface. About 5.0 × 3.5 inches. Clutch size is 7–10 eggs; incubation lasts about 56 days.
Black Tinamou (Tinamus osgoodi)
The Black Tinamou is a secretive, ground-dwelling bird of the montane cloud forests of Colombia and Peru. Tinamous are among the most ancient lineages of living birds, more closely related to ratites (emus, ostriches) than to typical ground birds.
They are heard far more often than seen — their haunting, melodic calls echo through the forest, but the birds themselves remain hidden in dense undergrowth.
Eggs: Glossy teal-green or turquoise, with a highly polished surface that almost appears lacquered. About 2.0 × 1.5 inches. Clutch of 4–8. As with emus, the male incubates and tends the chicks.
Common Myna (Acridotheres tristis)
Native to South Asia, the Common Myna has been introduced to many parts of the world, including Australia, New Zealand, South Africa, and the Middle East, and is considered one of the world's most invasive bird species.
It is a bold, confident bird with a brown body, a black head, a yellow bill and eye-patch, and white wing patches visible in flight. Mynas are vocal and highly adaptable, thriving wherever humans have altered natural landscapes.
They nest in cavities: tree holes, building recesses, drain pipes, and nest boxes. Their adaptability means they frequently displace native cavity-nesting birds.
Eggs: Blue-green with faint brownish or purplish speckling. About 1.1 × 0.8 inches. Clutch of 4–6; both parents incubate for 13–14 days.
Blue Finch (Porphyrospiza caerulescens)
The Blue Finch is a striking species of central South American grasslands and scrub. Males are deep blue, while females are brownish and less conspicuous.
It is considered near-threatened due to ongoing habitat loss in the cerrado, one of the world's most biodiverse and threatened savanna ecosystems.
Eggs: Pale blue, smooth, and unmarked. About 0.6 × 0.5 inches. Clutch typically 3–4; incubation around 12–13 days in a cup nest built in low scrub.
When to Find Blue Eggs: Seasonal Guide
Most blue-egg-laying birds breed in spring and early summer, though timing varies by region and climate.
| March – April | American Robin, Eastern Bluebird, Eurasian Robin, Song Thrush | First clutches appearing; look for nest-building activity |
| May – June | Red-winged Blackbird, Blue Jay, Gray Catbird, Dunnock, Linnet | Peak nesting season; most species on second clutch by June |
| July – August | American Goldfinch (peak), House Finch, Mockingbird | Goldfinch nests late; many species on final clutch |
| Year-round (tropics) | Emu (Australia, autumn–winter), Blue Finch, Black Tinamou | Timing varies by hemisphere and local rainfall patterns |
How to Attract Blue-Egg Birds to Your Garden
Many species on this list will nest in gardens if the habitat is suitable. Here are some of the best ways to attract them:
- Install the right nest box. Bluebirds prefer boxes with an entrance hole of about 1.5 inches (38 mm). Open-fronted or partially open nest structures may appeal to robins and some thrushes.
- Plant native berry-producing shrubs. Berry-producing plants such as dogwood, elderberry, hawthorn, and serviceberry provide both food and cover.
- Leave a muddy patch. American Robins use mud as a key nest-building material. A small, reliably damp area in the garden provides a critical resource during the dry early spring period when mud is scarce.
- Provide water. A shallow birdbath or garden pond attracts a wide range of birds. Keep water clean and fresh, and add a dripping or moving water feature to make it more attractive to small songbirds like catbirds, warblers, and finches.
- Use an AI-enabled feeder to monitor nest activity. The Birdfy Smart Feeder uses on-device AI to identify visiting species in real time, helping you track which blue-egg-laying species are present in your garden and when they are most active.
Watch Nesting Birds Live
Want to witness blue eggs hatching from the comfort of your home? The Birdfy Nest Duo Smart Birdhouse features dual HD cameras: one showing the interior of the nest box and one the entrance with night vision and motion-triggered recording. You can watch incubation, hatching, and the first days of chick development live on your phone.
Pair it with a Birdfy Smart Feeder to identify adult birds visiting your garden and link sightings to active nests nearby. Perfect for bluebird, robin, and starling monitoring.
FAQs about Birds that Lay Blue Eggs
What small bird lays tiny blue eggs?
Several small birds lay tiny blue or bluish eggs. Good examples include the American Goldfinch, Blue-gray Gnatcatcher, Dunnock, Common Linnet, and House Finch.
Do blue eggs mean the chicks hatch faster?
No, egg color does not affect incubation length. The blue coloration comes from biliverdin pigment deposited in the shell and has no relationship to hatching speed. Incubation periods depend on species size, nest type, and climate.
Are blue bird eggs rare?
They are not extremely rare, but they are still found in only a minority of bird species worldwide. Blue and blue-green eggs are especially common among thrushes, some cavity nesters, certain waterbirds, and a few finches and corvids.
What should I do if I find a blue egg?
Do not handle or move it. Wild bird eggs are protected by law in most countries, and disturbing a nest is illegal. If the egg appears to have fallen from a nest and the nest is accessible, you can carefully place it back.
Can you identify a bird from egg color alone?
Not always. Egg color can be helpful, but accurate identification usually also depends on egg size, markings, nest type, location, habitat, and season.
Which birds with blue eggs nest in boxes?
The best-known nest-box users with blue eggs are Eastern Bluebird, Western Bluebird, and Mountain Bluebird. European Starlings and Eurasian Jackdaws also use cavities and boxes readily.
Summary
Blue eggs are one of the most beautiful and memorable features in the bird world. Their color comes mainly from the pigment biliverdin, and their shades range from pale sky blue to deep turquoise and blue-green.
From the familiar American Robin and Eastern Bluebird to the vivid eggs of the Dunnock, Song Thrush, Gray Catbird, and even the massive dark eggs of the Emu, blue eggs appear across many habitats and continents.
If you are trying to identify a blue egg, look beyond color alone. Size, markings, nest shape, habitat, and season will all help you make a more reliable identification.
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