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Eastern Bluebird

Eastern Bluebird

Sialia sialis

Least Concern

Quick Facts

Kingdom: Animalia
Abundance: Common
Habitat: Forest, Grassland, Urban
Active Seasons: Spring, Summer, Fall, Winter
Activity: Diurnal (Active during day)
Lifespan: 6 to 10 years in the wild; the oldest recorded individual lived 10 years and 5 months

The Eastern Bluebird is a small thrush measuring 16 to 21 cm in length with a wingspan of 25 to 32 cm. Males display brilliant royal blue upperparts with a warm rusty-red breast and white belly, while females are more subdued grayish-blue with a softer orange-brown breast. Both sexes have a slender, straight black bill adapted for catching insects, and dark gray to blackish legs. Juveniles are grayish with spotted breasts and blue-tinged wings and tail.

Diet

Approximately 68% insects including grasshoppers, crickets, beetles, caterpillars, and spiders, typically spotted from a perch and caught on the ground. The remaining diet consists of fruit and berries including flowering dogwood, holly, mulberry, wild grape, Virginia creeper, pokeweed, and viburnum.

Activity Pattern

Diurnal (Active during day)
Kingdom: Animalia
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Phylum: Chordata
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Class: Aves
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Order: Passeriformes
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Family: Turdidae
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Genus: Sialia
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Species: S. sialis

Scientific Name

Sialia sialis
Breeding Season
March through August
Nesting Season
March through August, typically raising two broods per year
Migration Pattern
Partial migrant; northern populations move south in winter, while southeastern populations are largely year-round residents
Lifespan
6 to 10 years in the wild; the oldest recorded individual lived 10 years and 5 months

Behavior

Eastern Bluebirds are generally monogamous cavity nesters that prefer abandoned woodpecker holes and nest boxes. Females construct cup-shaped nests lined with soft grass over about 10 days and lay 3 to 7 pale blue eggs per clutch. They are perch-and-pounce hunters, sitting on low branches or fence posts and dropping to the ground to catch insects. In winter, they form mixed-species flocks and forage in hedgerows and woodland edges. They are territorial during breeding season but become more social in the non-breeding months.

Ecological Role

Eastern Bluebirds serve as important insect population regulators, consuming large quantities of grasshoppers, beetles, and caterpillars that can be agricultural pests. They also play a role in seed dispersal by consuming wild fruits and berries. As cavity nesters, they are part of the ecological succession of tree cavity use, often depending on woodpecker-created holes.

Active Seasons

Spring Summer Fall Winter

Activity Pattern

Diurnal (Active during day)

Habitat Types

Forest
Grassland
Urban

Geographic Distribution

The Eastern Bluebird is found throughout the eastern United States and southeastern Canada, extending south into Central America. In the southeastern US, it is a common year-round resident across Georgia, South Carolina, and the broader Piedmont and Coastal Plain regions. In the River Island Conservancy area near Augusta, GA, Eastern Bluebirds are regularly observed in open fields, pastures, and woodland edges along the Savannah River corridor, where nest boxes have helped sustain healthy local populations.

Elevation Range

0-5000 ft

Local Abundance

Common

Conservation Status

Least Concern

This species is widespread and abundant. No immediate threat to survival.

Threats & Impacts

Habitat loss due to removal of dead trees and fence rows, competition for nesting cavities from European Starlings and House Sparrows, pesticide use reducing insect prey, and severe winter weather events. Nest box programs have successfully mitigated many of these threats since the 1960s and 1970s.

How You Can Help

  • Report sightings to contribute to population monitoring
  • Support habitat conservation efforts
  • Follow guidelines when observing wildlife
No field notes or observations available for this species.

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