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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 © Brooke Miller | Macaulay Library

Female/immature

Photo © Erica Rutherford/ John Colbert | Macaulay Library

Juvenile

Photo © Robert Hamilton | Macaulay Library

Female/immature

Photo © Kai Frueh | Macaulay Library

Adult male

Photo © Jerry Ting | Macaulay Library

Adult male

Photo © Tim Lenz | Macaulay Library

Adult male

Photo © Logan Lalonde | Macaulay Library

Female/immature

Photo © Alex Lamoreaux | Macaulay Library

Habitat

Photo © Jerry Elling | Macaulay Library

Song

© Geoffrey A. Keller | Macaulay Library

Song

© Thomas G. Sander | Macaulay Library

Calls

© Geoffrey A. Keller | Macaulay Library

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.