Yellow-rumped Warbler

Setophaga coronata
STANFORD LOCATIONS:

Common migrant and winter resident in various habitat types throughout campus. Densities may be quite high at flowering eucalyptus trees. [Breeding males have a black bib.]
  
Nest
Location
Nest
Type
Eggs
Mating System
Dev.
Parental Care
Primary &
2ndary Diet
Foraging
Strategy
F
I: 12-13 DAYS
ALTRICIAL
4 feet - 50 feet
F
4-5
(3-5)
MONOG
F: 10-12 DAYS
MF(?)
BERRIES
HAWKS
HOVER &
GLEAN
BREEDING: Conif and conif-decid forests. Often 2 broods.
DISPLAYS: Courting male follows female, fluffs side feathers, raises wings, erects crown feathers, calls, and flutters.
NEST: Usu on horizontal branch; of shredded bark, weed stalks, twigs, rootlets, some lined with feathers interwoven so tips curve over and screen eggs, other linings including hair.
EGGS: White to creamy, marked with browns, grays, occ wreathed. 0.7" (18 mm).
DIET: Tends to be more insectivorous in w than in e; berries of shrubs, esp in winter.
CONSERVATION: Some sedentary in winter, some s to C.A. Common (e) or rare (w) cowbird host; female may destroy cowbird eggs by burying in base of nest.
NOTES: One of the most generalized and opportunistic of all our insectivorous birds. Gregarious, often assoc in flocks. Males tend to forage higher than females. May skim swallow-like over water eating insects from surface. One of last warblers to migrate. Most abundant wood warbler in Canada. Occ roost communally in winter. Until recently, e and w populations were considered separate species, Myrtle (e) and Audubon's (w) Warblers.
ESSAYS: Taxonomy and Nomenclature; MacArthur's Warblers; Migration; Bird Guilds; Species and Speciation; Cowbirds.
REFERENCES: Harrison, 1984; Morse, 1980.

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Except for Stanford Locations, the material in this species treatment is taken, with permission, from The Birder's Handbook (Paul Ehrlich, David Dobkin, & Darryl Wheye, Simon & Schuster, NY. 1988).