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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 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 ...
The average size of an egg is 19 mm × 15 mm (0.75 in × 0.59 in) with a weight of 2.2 g (0.078 oz). The eggs are incubated for 10–16 days by the female. [32] The chicks are altricial, hatching nearly naked with closed eyes, and are fed by both parents but mainly by the female, who broods them for around six days. [34]
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]
Purple finch Male Female Haemorhous purpureus (Gmelin, 1789) Two subspecies. ... House finch Male Female Haemorhous mexicanus (Müller, 1776) ...
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 black swan, Cygnus atratus is a large waterbird which breeds mainly in the southeast and southwest regions of Australia.An estimated one-quarter of all black swans pairings are homosexual and they steal nests, or form temporary threesomes with females to obtain eggs, driving away the female after she lays the eggs.
After mating, the female will lay a clutch of about 4–8 eggs. Both parents help brood the eggs during the daytime, and it is the female who stays on the eggs at night. When the eggs hatch, both parents care for the young. Gouldian finches leave the nest after between 19 and 25 days and are completely independent at 40 days old. [24]