I've had the good fortune to see all three of the island endemic leafbirds. One of them is the Yellow-throated Leafbird (right), found only on Palawan I. and adjacent Balabac and Calamian islands. Leafbirds were traditionally considered closely related to the Ioras (Aegithinidae). Like ioras they tend to forage alone or in pair in the subcanopy, often eating berries and fruit and well as insect prey. Even some recent literature place the leafbirds together with the ioras in the same family (e.g., Kennedy et al. 2000). But DNA studies (Sibley & Ahlquist 1990) showed that leafbirds were not that closely related to ioras but were more closely related to bushshrikes, helmetshrikes and vangas within a broad corvine assemblage that arose in Australasia. They have fairly hefty bills for their size (recalling a miniature cuckoo-shrike) but are short-tailed. Once also considered related to the bulbuls (Pycnonotidae) but having some characters of drongos (Dicruridae) or cuckoo-shrikes (Campepahagidae; Austin & Singer 1961), Sibley & Monroe (1990) placed then next to cuckoo-shrikes in their own family.
Leafbirds are clearly closely related to the two species of Fairy-Bluebird (genus Irena) which some place in the family Irenidae (which name takes precedence over Chloropseidae). Many recent books on Asian birds lump them together in the same family. Taxonomic relationships of these Asian families remain uncertain and controversial. The Handbook of the Birds of the World project apparently will separate the Leafbirds as a family and split off the Fairy-Bluebirds as another. This family-splitting seems odd when they haven't split up the barbets (into three) which proposal is supported by substantial biochemical evidence and other analysis. But they've adopted a more traditional approach and so I've just followed suit.
Photo: The Gold-fronted Leafbird Chloropsis aurifrons (top) was at the Quality Inn near Ramnagar, Uttar Pradesh, India, on 13 Mar 2001. The Yellow-throated Leafbird Chloropsis palawanensis (top) was photographed at Balsahan, Palawan, Philippines, on 21 Feb 1990. Photos © 2001 D. Roberson, all rights reserved.
There is no family book as yet nor much written about this group at all.
Other literature cited:
Austin, O. L., and A. Singer. 1961. Birds of the World. Edited by H. S. Zim. Golden Press, New York.TOP
Kennedy, R. S., P. C. Gonzales, E. C. Dickinson, H. C. Miranda, Jr., and T. H. Fisher. 2000. A Guide to the Birds of the Philippines. Oxford Univ. Press, Oxford, U.K.
Sibley, C. G., and J. E. Ahlquist. 1990. Phylogeny and Classification of Birds: A Study in Molecular Evolution. Yale Univ. Press, New Haven, CT.
Sibley, C. G., and B. L. Monroe, Jr. 1990. Distribution and Taxonomy of Birds of the World. Yale Univ. Press, New Haven, CT.
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Page created 23 Mar 1999, revised 2-3 May 2001