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Field
Guide IDs: BREEDING:
Conif and
conif-decid forests.? broods. DISPLAYS:
? NEST:
Usu far out on
horizontal branch of fir; relatively shallow, of
grass, moss, cedar bark, fir twigs, plant fibers,
lined with moss, feathers, hair. EGGS:
White, marked with
browns, usu mostly at large end but not wreathed.
0.7" (18 mm). DIET:
Largely or entirely
insects; also few seeds, plant galls. CONSERVATION:
Winters s through
highlands of Mexico to Costa Rica. Rare cowbird
host. NOTES:
Female allows close
approach when incubating, then drops to ground and
disappears. During summer, activities confined to
highest parts of trees. In winter in N.A., joins
mixed-species flocks of chickadees, nuthatches,
etc.; in Mexico and C.A., often gregarious, forming
single-species flocks and feeding on fruit and
nectar. Birds breeding on islands off BC winter in
U.S. and have longer wings and smaller bills than
birds breeding elsewhere and wintering s of
U.S. Uncommon migrant
and winter resident in various habitat types
throughout campus. A few can be found in oaks and
eucalyptus trees near the Mausoleum in fall and
winter. ESSAYS: Species
and Speciation;
Superspecies;
Bird
Guilds;
Decline
of Eastern
Songbirds;
Mixed-Species
Flocking;
Wintering
and Conservation REFERENCES:
Harrison, 1984;
Morrison, 1983. |
