Carpodacus purpureus is a monogamous species, although the length of a pair-bond is unknown. Males perform elaborate courtship displays to attract mates. Once a female is in his territory, a male will rapidly flutter his wings while hopping, thrusting out his breast, raising his crest feathers, cocking up his tail, and singing a soft warble. During this display he often holds nesting material in his bill. The male then flies directly upwards to about 30 cm high. Upon landing, he droops his wings and uses his tail to support him as he raises his head and tilts his body backwards as far as possible. Interested females may respond by drooping and fluttering their wings or beginning to search for a nesting site.
Mating System: monogamous
Carpodacus purpureus breeds once annually between the months of April and August. After pair formation, pairs select a suitable nesting site which is most often in the branches of a conifer. The female completes most of the nest construction alone, with only occasional assistance from the male. She builds a cup-shaped nest out of twigs, roots, grasses, hair, or moss. The construction process typically lasts 3 to 8 days. One to five days after the nest is complete, the female lays 4 to 6 eggs which are greenish-blue in color and speckled with brown or black. The female alone develops a brood patch and thus she performs all incubation duties. During this time, the male frequently provides food to the female whether she is on or off the nest. The young hatch after an average 13 day incubation period and the young fledge after an additional 13 to 16 days. Fledglings are fed by the parents for an unknown period of time. Carpodacus purpureus juveniles may breed during the following breeding season when they are less than 1 year old.
Breeding interval: Purple finches breed once annually.
Breeding season: The breeding season for purple finches occurs from April to August.
Range eggs per season: 3 to 6.
Average eggs per season: 4 to 5.
Average time to hatching: 13 days.
Range fledging age: 13 to 16 days.
Average fledging age: 14 days.
Average age at sexual or reproductive maturity (female): <1 years.
Average age at sexual or reproductive maturity (male): <1 years.
Key Reproductive Features: seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate)
Carpodacus purpureus is born altricial and therefore requires a significant parental investment. Both the male and female select a nesting location, however the female completes most or all of the nest construction. As only the female develops a brood patch, she also performs all of the incubation and brooding. While the female is busy incubating the male frequently provides her with food. Once the young hatch, both parents actively feed the young through regurgitation. The young are fed a diet that is almost entirely seeds. Both parents also participate in nest sanitation and will remove nestlings' fecal sacs to reduce predation or spread of disease. After the young have fledged, both parents continue to provide food for an unknown period of time.
Parental Investment: altricial ; male parental care ; female parental care ; pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Male, Female); pre-weaning/fledging (Provisioning: Male, Female, Protecting: Male, Female); pre-independence (Provisioning: Male, Female, Protecting: Male, Female)