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The male also feeds the female during breeding and incubation of the eggs, and raising of the young, [17] and the male is the primary feeder of the fledglings (who can be differentiated from the females by the pin feathers remaining on their heads). Females are typically attracted to the males with the deepest pigment of red to their head, more ...
The eggs are incubated by the female alone, though the male brings her food as she nests, and most mating pairs raise only one brood each year. [21] The chicks hatch 12–14 days after incubation begins. Like all passerines, the chicks are altricial; they are hatched naked, with reddish bodies, pale grey down, and closed eyes. [31]
The eggs are incubated for 11–13 days by the female, who is fed by the male. The chicks are fed by both parents. Initially they receive a mixture of seeds and insects, but as they grow the proportion of insect material decreases. [25] For the first 7–9 days the young are brooded by the female. The nestlings fledge 13–18 days after hatching.
They range from light blue to dark olive-brown and have pink to rusty red spots and blotches. On average they measure 19.4 mm × 14.5 mm (0.76 in × 0.57 in) and have a calculated weight of 2.14 g (0.075 oz). Starting after the last egg has been laid, they are incubated by the female and hatch after 11–12 days.
The specific epithet psaltria is Ancient Greek for a female harpist. [5] The type locality is Colorado Springs, Colorado. [6] The lesser goldfinch is now placed in the genus Spinus that was introduced in 1816 by the German naturalist Carl Ludwig Koch. [7] [3] Five subspecies are currently recognized, [3] though their validity has been ...
Sperm competition occurs when a female is inseminated by multiple males during one breeding season resulting in differential fertilization success among males. In birds, the last male to inseminate the female usually fertilizes the highest proportion of eggs because by the time fertilization occurs, the oldest spermatozoa have been lost. [42]
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The female lays between 2 and 6 eggs. [20] [22] [29] The eggs are white or light grey or light blue, with small brown spots [20] [22] and they are approximately 16.5 mm by 12 mm in size. [13] [20] [22] Incubation takes between 10 and 14 days and is carried out entirely by the female. [12] [20] [22] The chicks are altricial and nidicolous. They ...