Eastern Bluebird

Scientific Name: Sialia sialis

Classification: Order: Passeriformes; Family: Turdidae

Eastern Bluebird

Brief Description

A small, stocky thrush with a big head and large eyes. It is known for its upright posture and frequent perching on wires and fences to hunt for insects.

Additional Information

  • Region of Origin: North America. Currently ranges across Eastern North America, from southern Canada to the Gulf Coast, and south through Central America to Nicaragua.
  • Typical Sighting Period: Year-round in the southern US; late spring through early fall in the northern reaches of its range.
  • Plumage Details: Adult males (like the one pictured) have a vibrant deep blue head, back, and wings with a rusty reddish-orange throat and breast. Females are duller with more grey-blue on top and lighter orange on the breast. Juveniles are brownish with blue in the wings and tail and have spotted breasts.
  • Ecological Significance: Acts as a natural pest controller by consuming large quantities of insects. They are also important cavity nesters and compete for nesting sites, helping maintain biodiversity in secondary cavity-nesting communities.
  • Conservation Status: Least Concern (IUCN). Populations are increasing due to widespread installation of bluebird nest boxes.
  • Observation Tips: Look for them in open fields, orchards, and along roadsides. Providing a nest box or mealworms in a tray feeder is a reliable way to attract them to gardens.

Size & Weight

Length: 6-8 in (16-21 cm); Wingspan: 9-12 in (25-32 cm); Weight: 0.9-1.2 oz (27-34 g).

Diet

Mainly insects (beetles, crickets, grasshoppers) and spiders during the breeding season; fruits and berries (mistletoe, sumac, cedar) during winter.

Habitat

Open woodlands, farmlands, orchards, parks, and suburban gardens with scattered trees and low ground cover.

Migration

Resident in the southern US and Mexico; migratory in the northern US and Canada, moving south in late autumn.

Voice (Call & Song)

A soft, melodious 'tu-a-wee' or 'purity' song. The call is a short, low-pitched 'pew' or 'mew'.

Nesting & Breeding

Secondary cavity nesters. They use old woodpecker holes or nest boxes. The female builds a cup-shaped nest of grass. Clutch size is typically 2-7 pale blue eggs.

Key Field Marks

Blue upperparts, rusty-red throat and breast, white belly, and a fairly short, thin bill.

Similar Species

Western Bluebird (has a blue throat instead of orange); Mountain Bluebird (entirely sky-blue without the red breast).

Interesting Facts

The Eastern Bluebird is the state bird of both Missouri and New York. They were once in serious decline due to competition with invasive House Sparrows and European Starlings, but have made a massive recovery thanks to human-made nest boxes.