Change Species:

Western Bluebird (Sialia mexicana)


Photo © Mike Wisnicki

Western Bluebird nest

Photo © René Corado

Western Bluebird white eggs

Photo © René Corado

Western Bluebird eggs

Photo © S. Mulaney

Western Bluebird nestlings

Photo © Ruth Mattes

Western Bluebird juvenile

Photo © Jim Barnhart

Adult male

Photo © Barbara Pursell/PFW

Adult male

Photo © Jamie Chavez

Adult female

Photo © Tiny Gehrke/PFW

Dawn song

© Geoffrey A. Keller

Chicks and food delivery at nest

© Kevin J. Colver

Song and chatter

© Geoffrey A. Keller

Chatter calls

© Geoffrey A. Keller

Warbled song

© Thomas G. Sander

Rapid "few" song

© Robert C. Stein

When To Look

Source: Birds of North America Online

Where To Find It

Habitats

grassland

open woodland

river

Substrates

Nestbox or Birdhouse

Live Tree Cavity

Dead Tree Cavity

What You'll Find

Nest Type

cavity

Chick

Altricial

Clutch Size

2
5
6
8

Nest Height

20 ft
5 ft

Nesting Statistics

Incubation Period

12-18
days

Brooding Period

18-25
days

Useful Hints

  • A paired male and female search for nest sites together, inspecting cavities to see if they are suitable.
  • The females do almost all of the nest construction, gathering grasses, straw, pine needles, moss, other plant fibers, and fur from the ground and carrying it to the nest. She lines the nest cup with grasses, rootlets, feathers, horsehair, and sometimes bits of plastic.
  • Western Bluebirds exhibit cooperative breeding; 2–14% of pairs have helpers at the nest. Helpers are typically juveniles from a previous brood, although adults may also help nesting pairs if they do not have their own territory or if their own nest has failed.
  • Western Bluebirds can nest up to three times per season.