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sunbittern
The sunbittern (''Eurypyga helias'') is a bittern-like bird of tropical regions of the Americas, and the sole member of the family Eurypygidae (sometimes spelled Eurypigidae) and genus ''Eurypyga''. It ranges from Guatemala to southern Peru, showing three extant subspecies. The sunbittern shows both morphological and molecular similarities with the kagu (''Rhynochetos jubatus'') of New Caledonia, indicating an gondwanic origin, being both placed in the clade Eurypygiformes.〔del Hoyo, J. Elliott, A. & Sargatal, J. (editors). (1996) ''Handbook of the Birds of the World. Volume 3: Hoatzin to Auks''. Lynx Edicions. ISBN 84-87334-20-2〕
==Taxonomy==
The sunbittern is usually placed in the Gruiformes, but this was always considered preliminary. Altogether, the bird is most similar to another bird that was provisionally placed in the Gruiformes, the kagu (''Rhynochetos jubatus'').〔Houde ''et al.'' (1997) Phylogeney and evolution of 12S rDNA in Gruiformes (Aves). In: Mindell, D. P. (ed.), Avian Molecular Evolution and Systematics. Academic Press, San Diego. Pp. 121–158.〕 Molecular studies seem to confirm that the kagu and sunbittern are each other's closest living relatives and have a similar wing display.〔Fain & Houde (2004) (Parallel radiations in the primary clades of birds ). ''Evolution'' 58(11): 2558–2573.〕〔Ericson ''et al.'' (2006) (Diversification of Neoaves: Integration of molecular sequence data and fossils ). Biology Letters 2 (4): pp. 543–547〕 They are probably not Gruiformes (though the proposed Metaves are just as weakly supported).〔Morgan-Richards ''et al.'' (2008) Bird evolution: testing the Metaves clade with six new mitochondrial genomes. BMC Evolutionary Biology 8 (20).〕 Altogether, the two species seem to form a minor Gondwanan lineage which could also include the extinct adzebills and/or the mesites, and is of unclear relation to the Gruiformes proper. Notably, the kagu and mesites also have powder down.
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