Tuesday, August 11, 2020

Huia ( Heteralocha acutirostris : Callaeidae)-like sexual bill dimorphism in some birds of paradise (Paradisaeidae) and its significance

TitleHuia ( Heteralocha acutirostris : Callaeidae)-like sexual bill dimorphism in some birds of paradise (Paradisaeidae) and its significance
Publication TypeJournal Article
Year of Publication1997
AuthorsFrith, CB
JournalNotornis
Volume44
Issue3
Pagination177-184
Type of Articlepaper
KeywordsBirds of paradise, Heteralocha acutirostris, Huia, Sexual bill dimorphism
Abstract

The rare reversed sexual bill dimorphism of the extinct New Zealand endemic bird species, the Huia (Heteralocha acutirostris: Callaeidae) occurs in two Australian riflebird (Ptiloris) and three New Guinea sicklebill (Epimachus [Drepanornis]) birds of paradise (Paradisaeidae). While less extreme than that of the Huia, the female bill length proportionate to tarsus length is 7-18% longer than in males. In this proportionate bill length, females are longer-billed than males in most typical (polygynous) birds of paradise. More marked examples of reversed sexual hill dimorphism in the Paradisaeidae occur in species with greater proportions of wood-dwelling arthropods in their diets. Ecological studies of these species might provide insights into the way Huia lived and how their bill dimorphism evolved.

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