• East view from Crissy Field overlook with old Coast Guard station on left and city on right

    Presidio of San Francisco

    California

Brown-headed Cowbird

(Molothrus ater)
 
Brown-headed Cowbird
A male Brown-headed Cowbird perches on Coyote Brush near Crissy Marsh.
Will Elder, NPS
 

Natural History: The Brown-headed Cowbird feeds on insects and other invertebrates, as well as seeds and grains. It often takes cover in dense foliage, but also is seen resting on telephone poles and lines. This bird lays its eggs in the nests of other species, especially warblers, finches, flycatchers, and vireos and displaces the young of those species. Breeding season runs from March to August.

General Distribution: In the Presidio, this species is found in all habitat areas. It is a nest parasite in the Presidio that is becoming increasingly common.

Frequency: This species is common to abundant in all seasons except winter.

Identifying Characteristics: Males are iridescence black with a brown head and dark eyes. Females tend to be grayish-brown with weekly striped breast.

Presidio Birds main page

Did You Know?

Detail from Spanish Coat of Arms

While stationed at the Presidio, the U.S. Army adopted the Coat of Arms of Royal Spain for heraldry purposes. The seal appeared on vehicles, signs, and badges throughout the post.