Blue Jay
Cyanocitta cristata
Corvidae
The loud, brilliantly blue crested jay that most people either love or resent. Blue Jays are arguably the most ecologically important yard bird in New Jersey — they are single-handedly responsible for the northward spread of oak forests. They cache acorns for winter, forget many, and inadvertently plant thousands of trees per bird over a lifetime.
How to spot one.
9–12 inches — larger than a robin, smaller than a crow
Brilliant blue back, wings, and tail with black barring and white patches
Prominent black necklace across the throat
White face and belly, blue crest
Very loud harsh 'jay! jay!' calls; also mimics hawks
What it sounds like.
Best known for the harsh 'jay! jay!' scream; also imitates Red-shouldered and Red-tailed Hawks. Actual song is a soft, sweet, whisper-quiet warble only heard at close range.
How it lives.
Highly intelligent — corvid family. Caches acorns and seeds in the ground; recovers many but forgets enough to plant oak groves. Alarm-calls at hawks and cats, alerting other yard birds. Migrate erratically — some go south each fall, some don't, and the pattern varies year to year.
The spec sheet.
- Status
- Year-round resident
- Size
- 9–12 inches
- Present in NJ
- Year-round
- Native to NJ
- Yes
- Conservation status
- stable
- Family
- Corvidae
What it eats.
Diet often shifts dramatically between breeding season and the rest of the year — especially for insectivorous birds that pivot to native berries in fall and winter.
Summer / breeding season
Acorns, beechnuts, other nuts
Insects (beetles, caterpillars, grasshoppers)
Berries
Occasionally eggs or nestlings of other birds
Fall / winter
Cached acorns and beechnuts
Sunflower seeds and peanuts at feeders
Persistent berries
What it needs.
Native plants that feed this bird or provide shelter. Names in hydrangea link to the plant’s Field Guide entry.
Native oaks (Quercus)
Fruit / berry source
American beech, hickory
Fruit / berry source
Fruit / berry source
All About Birds (Cornell) · Duke Farms Fall & Winter Visitors
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