Why these birds look blue
Most blue in birds is not a pigment. Tiny structures in the feathers scatter light so that blue wavelengths are reflected back to your eye. This is why a blue bird can look dull gray or even black when the light is behind it, and bright when the sun hits it from the right angle.
This list focuses on birds you might realistically see in a North American yard or park. Photos in your own field guide or a trusted bird app will help confirm what you read here.
The three true bluebirds
The true bluebirds belong to the genus Sialia. North America has three: Eastern, Western and Mountain. They are small thrushes, often seen perched on fences, wires or low branches, dropping to the ground to catch insects.
Eastern Bluebird
Males have a deep blue back, head and tail with a rusty-orange throat and breast and a whitish belly. Females are paler and grayer, with blue showing mostly on the wings and tail. They favor open country with scattered trees, such as fields, pastures, golf courses and large lawns, across eastern North America.
Western Bluebird
Males are blue above and on the throat, with an orange breast and flanks, and often some rusty color across the back. Females are duller, with a gray-brown head and back and a hint of blue in the wings and tail. They live in open woodlands and similar habitats in the western states.
Mountain Bluebird
Males are a pale sky blue overall, lighter underneath, with no orange. Females are mostly gray-brown with blue tinges on the wings and tail. They like open, high-elevation country in the West and often hover over grass while hunting.
Blue jays and relatives
Jays are larger, louder and bolder than bluebirds. Many readily visit feeders, especially for peanuts and sunflower seeds.
- Blue Jay: Blue crest and back, white underparts, and a black necklace. Common in eastern and central North America.
- Steller’s Jay: Black head and crest with a dark blue body. A western species; see our guide to the blue and black bird if that matches your sighting.
- California Scrub-Jay: Blue head, wings and tail with a grayish-brown back and pale gray underparts. Found along the Pacific coast states.
- Other jays: Island, Florida, Woodhouse’s and Mexican Jays and the Pinyon Jay are blue or blue-gray species with more limited ranges.
Small blue birds: buntings and grosbeaks
- Indigo Bunting: The male is a small, deep blue bird in summer, mostly in the eastern half of the continent. In poor light it can look nearly black. Females are plain brown.
- Lazuli Bunting: Western. Males have a blue head and back, an orange-tinted breast band and a white belly.
- Blue Grosbeak: Larger than the buntings, with a thick bill and two rusty wing bars on a deep blue male.
Blue-backed swallows and aerial birds
Swallows spend much of their time in flight, but they perch on wires and use nest boxes. Tree Swallows are iridescent blue-green above and white below. Violet-green Swallows are similar in the West. Barn Swallows are steel blue above with a rusty throat and a deeply forked tail. Male Purple Martins look dark blue-black and glossy.
Other blue birds worth knowing
- Belted Kingfisher: Blue-gray with a shaggy crest, usually near water.
- Blue-gray Gnatcatcher: A tiny, long-tailed, blue-gray insect eater.
- Black-throated Blue Warbler and Cerulean Warbler: Blue-backed warblers of eastern forests; you are more likely to find them in the canopy than at a feeder.
Quick comparison
| Bird | Main blue areas | Other key marks | Region |
|---|---|---|---|
| Eastern Bluebird | Back, head, tail | Orange breast, white belly | East |
| Western Bluebird | Head, back, throat | Orange breast, sometimes rusty back | West |
| Mountain Bluebird | Nearly all over | No orange; pale blue | Mountain West |
| Blue Jay | Back, wings, crest | Black necklace, white underparts | East and central |
| Steller’s Jay | Body, wings, tail | Black head and crest | West |
| Indigo Bunting | Whole body (male) | Small, cone-shaped bill | East, summer |
| Barn Swallow | Back, wings | Rusty throat, forked tail | Widespread, summer |
Birds mistaken for bluebirds
The most common mix-ups are Blue Grosbeaks and Indigo or Lazuli Buntings (also blue, but with thick seed-eating bills), swallows (blue above but shaped for flight), and scrub-jays (much larger). The orange-breasted Lazuli Bunting is especially easy to confuse with a Western Bluebird at a distance. Check size, bill shape and habits: bluebirds sit upright and take insects from the ground. For a region-specific example, see our guide to types of bluebirds in California and lookalikes.
Frequently asked questions
What do bluebirds look like?
Males are blue above and, in the Eastern and Western species, orange on the breast. Females are paler and grayer with blue mainly on wings and tail. Mountain Bluebird males are sky blue without orange.
What is the most beautiful blue bird?
That is a matter of taste. Many birders pick the Indigo Bunting, Mountain Bluebird or Lazuli Bunting, but the best answer is usually the one you see up close.
Are all blue birds related?
No. Bluebirds are thrushes, jays belong to the crow family, and buntings and grosbeaks are in another family entirely. Blue coloration shows up in many unrelated groups.
Where to go next
If your bird has a dark body with a black head, start with our blue and black bird guide. If you live on the West Coast, see dark blue birds in California.