Tuesday, October 22, 2019

Identification of fledgling and juvenile Kaka ( Nestor meridionalis )

TitleIdentification of fledgling and juvenile Kaka ( Nestor meridionalis )
Publication TypeJournal Article
Year of Publication1995
AuthorsMoorhouse, RJ, Greene, TC
JournalNotornis
Volume42
Issue3
Pagination187-196
Type of Articlepaper
Keywordsgrowth, juvenile identification, Kaka, Nestor meridionalis
Abstract

Kaka (Nestor meridionalis) less than one year old can be distinguished from older birds by a pale ring of skin around the eye (periophalmic ring). In birds less than five months old this has a yellow tinge, as does the cere, gape and the soles of the feet. A further distinguishing feature of Kaka between three and six months of age are protruding rachides (feather quills) on the tips of the tail feathers. On Kapiti and Little Barrier Islands, most Kaka nestlings fledge in February and receive food from their parents until June or July. Fledglings can often be detected during this period by their conspicuous and frequent food-begging behaviour. Juvenile characteristics in the Kaka persist for a much shorter period than in the Kea (N. notabilis), its sole extant congener. The loss of juvenile characteristics prior to sexual maturity suggests that juvenile Kaka becomes socially independent of adults earlier than Kea, presumably because of more readily obtainable food sources in their environment.

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