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The eggs are incubated by the male and female for 12–14 days. After the eggs have hatched, the fledglings leave the nest in about 11 or 12 days, but they are unable to fly for another two weeks. The young are fed by both adults. The black-headed grosbeak's monogamy is under study, but pair bonds generally last for only one breeding season.
The black-backed grosbeak is approximately 22 cm (8.7 in) long and weighs 43.8 to 66.2 grams (1.54 to 2.34 oz). All of the subspecies except P. a. crissalis are very similar. The males' upperparts are black with a yellow shoulder patch; the closed wings show white patches.
The evening grosbeak is similar in appearance to the Eurasian hawfinch, both being bulky, heavily built finches with large bills and short tails. The evening grosbeak ranges in length from 16 to 22 cm (6.3 to 8.7 in) and spans 30 to 36 cm (12 to 14 in) across the wings.
Typically, fewer than 7% of grosbeak nests have cowbird eggs per one study. [38] Per the U.S. Bird Banding Laboratory, as of 1997, rose-breasted grosbeaks recovered when dead have largely collided with objects, including buildings and cars (17.2%) or had been shot (10%; mostly before 1960), 3.6% of the fatalities were caught by cats , 0.8% ...
The following is a list of grosbeak species, arranged in groups of closely related genera. These genera are more closely related to smaller-billed birds than to other grosbeaks. Exceptions are the three genera of "typical grosbeak finches", which form a group of closest living relatives and might thus be considered the "true" grosbeaks.
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The blue-black grosbeak construct little cup nests to lay their eggs in and normally have a clutch size of 2. [10] The breeding season of the blue-black grosbeak takes place during the spring and summer months, however the peak period of the breeding season differs slightly between populations located in different areas. [7]
The pine grosbeak (Pinicola enucleator) is a large member of the true finch family, Fringillidae. It is the only species in the genus Pinicola . It is found in coniferous woods across Alaska , the western mountains of the United States , Canada , and in subarctic Fennoscandia and across the Palearctic to Siberia .