||Small cup nest incubator
||Built in several upriht branches
or in fork of tree limb. Placed 1 to 30 feet above ground.
||Open deciduous and riparian woods;
weedy and cultivated fields with scattered trees; towns, farms.
||Mr. and Mrs. Carduelis tristis (AMERICAN
||Mrs. American Goldfinch (Mr. Goldfinch
only helps in site selection; his main duties are to feed the
mother and stand guard while she is working).
||2 7/8 inches
||2 3/4 inches
||1 5/8 inches
|MATERIALS OF CONSTRUCTION
||Neat cup of flexible vegetable fibers
lined with downy material and often woven so tightly that it
may hold water. Spider silk used to bind nest foundation to branch.
Other onsite and available materials as approved by architect
(i.e., Mrs. Goldfinch).
||Body heat from brood spot on the
underside of female's body (patch of skin plucked bare that covers
a rich supply of blood vessels, which supplies heat to the eggs).
|INSULATION (may also conceal eggs
from predators, shed water, deter pests, and cushion)
||Plant downs such as thistle and cattail
|ESTIMATED ENERGY INPUT FOR NEW CONSTRUCTION
||Data on food sources is too varied
to predict daily energy requirements. Main foods are seeds from
annual plants. Nest takes from about 4 to 15 days to complete.
||July to end of September to coincide
with maturing thistle seeds (weather dependent)
|FREQUENCY OF USE
||1 brood per season