The blue-faced honeyeater (Entomyzon cyanotis), also colloquially known as the Bananabird, is a passerine bird of the honeyeater family, Meliphagidae. It is the only member of its genus, and it is most closely related to honeyeaters of the genus Melithreptus. Three subspecies are recognised. At around 29.5 cm (11.6 in) in length, the blue-faced species is large for a honeyeater. Its plumage is distinctive, with olive upperparts, white underparts, and a black head and throat with white nape and cheeks. Males and females are similar in external appearance. Adults have a blue area of bare skin on each side of the face readily distinguishing them from juveniles, which have yellow or green patches of bare skin.
Found in open woodland, parks and gardens, the blue-faced honeyeater is common in northern and eastern Australia, and southern New Guinea. It appears to be sedentary in parts of its range, and locally nomadic in other parts; however, the species has been little studied. Its diet is mostly composed of invertebrates, supplemented with nectar and fruit. They often take over and renovate old babbler nests, in which the female lays and incubates two or rarely three eggs.
The blue-faced honeyeater was first described by ornithologist John Latham in his 1801 work, Supplementum Indicis Ornithologici, sive Systematis Ornithologiae. However, he described it as three separate species, seemingly not knowing it was the same bird in each case: the blue-eared grackle (Gracula cyanotis), the blue-cheeked bee-eater (Merops cyanops), and the blue-cheeked thrush (Turdus cyanous).[2][3] It was as the blue-cheeked bee-eater that it was painted between 1788 and 1797 by Thomas Watling, one of a group known collectively as the Port Jackson Painter.[4]
It was reclassified in the genus Entomyzon, which was erected by William Swainson in 1825. He observed that the "Blue-faced Grakle" was the only insectivorous member of the genus, and posited that it was a link between the smaller honeyeaters and the riflebirds of the genus Ptiloris.[5] The generic name is derived from the Ancient Greek ento-/εντο- 'inside' and myzein/μυζειν 'to drink' or 'suck'. The specific epithet, cyanotis, means 'blue-eared', and combines cyano-/κυανο 'blue' with otis (a Latinised form of ωτος, the Greek genitive of ous/ους) 'ear'.[6] Swainson spelt it Entomiza in an 1837 publication,[7] and George Gray wrote Entomyza in 1840.[8]
The blue-faced honeyeater is generally held to be the only member of the genus, although its plumage suggests an affinity with honeyeaters of the genus Melithreptus. It has been classified in that genus by Glen Storr,[9][10] although others felt it more closely related to wattlebirds (Anthochaera) or miners (Manorina).[11] A 2004 molecular study has resolved that it is closely related to Melithreptus after all.[12] Molecular clock estimates indicate that the blue-faced honeyeater diverged from the Melithreptus honeyeaters somewhere between 12.8 and 6.4 million years ago, in the Miocene epoch. It differs from them in its much larger size, brighter plumage, more gregarious nature, and larger patch of bare facial skin.[13]
Molecular analysis has shown honeyeaters to be related to the Pardalotidae (pardalotes), Acanthizidae (Australian warblers, scrubwrens, thornbills, etc.), and the Maluridae (Australian fairy-wrens) in the large superfamily Meliphagoidea.[14]