Blue Jays are unmistakable once you know them - bright blue, white, and black with a prominent crest. But several other blue birds get mistaken for them, especially at a distance or in unfamiliar territory.
Quick Comparison
| Bird | Size | Crest? | Key difference from Blue Jay |
|---|---|---|---|
| Steller’s Jay | 30-34cm | Yes, tall and dark | Deep blue and black. No white. Western N. America only. |
| California Scrub-Jay | 27-30cm | No | Blue back, grey-brown breast. No crest. Long tail. |
| Florida Scrub-Jay | 25-28cm | No | Duller blue. No crest. Grey forehead. Florida only. |
| Woodhouse’s Scrub-Jay | 27-30cm | No | Paler blue than California Scrub-Jay. Dull grey breast. |
| Pinyon Jay | 25-27cm | No | Uniform dull blue. Travels in large noisy flocks. |
| Mexican Jay | 28-30cm | No | Plain grey-blue. No crest, no necklace. SW US and Mexico. |
| Canada Jay | 25-33cm | No | Grey and white - not actually blue. Fluffy. Northern forests. |
| Mountain Bluebird | 16-18cm | No | Much smaller. Sky blue, no crest, no black markings. |
| Indigo Bunting | 12-13cm | No | Tiny. Electric blue. No white or black. Sparrow-sized. |
| Green Jay | 25-30cm | No | Green body, blue head. Texas and Central America. |
The Closest Match: Steller’s Jay
The Steller’s Jay is the Blue Jay’s closest relative and the bird most likely to cause genuine confusion. Both have crests, both are corvids, and both are bold, noisy, and visit feeders. The key differences:
- Colour - Steller’s Jay is dark blue and black with no white markings. Blue Jays have bright white and black barring on their wings and tail.
- Range - Steller’s Jay lives in western North America (Rockies to the Pacific). Blue Jays live in eastern and central North America. Where ranges overlap, hybrids occasionally occur.
- Habitat - Steller’s Jays prefer coniferous mountain forests. Blue Jays are equally at home in suburbs and deciduous woodland.
Scrub-Jays: Blue but No Crest
The three scrub-jay species - California, Florida, and Woodhouse’s - are the most common source of confusion. They are blue, they are jays, but they lack the Blue Jay’s crest entirely. They also have no black necklace marking.
If the blue jay you are looking at has no crest, it is not a Blue Jay. It is almost certainly a scrub-jay or a Pinyon Jay, depending on your location.
Small Blue Birds That Are Not Jays
Mountain Bluebirds and Indigo Buntings are blue but are much smaller than Blue Jays and completely different in shape and behaviour. Mountain Bluebirds are thrushes. Indigo Buntings are finch-sized. Neither has a crest, and neither belongs to the corvid family.
Blue Jay Basics
For comparison, here is what a true Blue Jay looks like:
- Bright blue back, wings, and tail with bold black and white barring
- White face and underparts with a black necklace across the throat
- Prominent blue crest that can be raised or lowered
- Size - About 25-30cm, roughly the size of a robin
- Range - Eastern and central North America
- Calls - Loud, harsh “jay jay” plus hawk mimicry
