Description of the Cerulean Warbler

BREEDING MALE

The Cerulean Warbler has white underparts with dark streaks on the flanks.

Males have dark blue upperparts, head, and neck, with a white throat and blue breast band. They have dark blue wings with two white wing bars.

 

cerulean warbler

Female

Females are an unusual shade of blue-green above, with a pale supercilium and grayish wings with two white wing bars.

 

cerulean warbler

Seasonal change in appearance

None.

Juvenile

Immatures are similar to adults, but duller.

Habitat

Cerulean Warblers inhabit mature, deciduous forests.

Diet

Cerulean Warblers eat insects.

Behavior

Cerulean Warblers forage rapidly, high in the tree canopy.

Range

Cerulean Warblers breed in parts of the eastern and central U.S. They winter in South America. The population has declined rapidly in recent decades.

More information:

Bent Life History

Visit the Bent Life History for extensive additional information on the Cerulean Warbler.

Fun Facts

Forest fragmentation and cowbird parasitism are listed as reasons for the sharp decline of this species.

The Cerulean Warbler is a candidate for listing under the Endangered Species Act.

Vocalizations

The song is a musical buzz.. A short, buzzy flight call is also given.

Nesting

The Cerulean Warbler’s nest is a cup of bark fibers and grasses, and is lined with finer materials. It is placed on a horizontal branch, usually quite high.

Number: Usually lay 3-5 eggs.
Color: Whitish with darker markings.

Incubation and fledging:

The young hatch at about 11-12 days and fledge at about 12 days, though remaining dependent on the adults for some time.