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Genus Ixos
Brown-eared Bulbul - Species: Hypsipetes amaurotis Ixos amaurotis Turdus amaurotis Temminck, 1830
Yellowish Bulbul - The Yellowish Bulbul is a species of songbird in the Pycnonotidae family. It is endemic to the Philippines.
Streaked Bulbul - What is presently known is that some Ixos species are close to Hypsipetes , while others – including the Streaked Bulbul – are closer to Hemixos. But the affiliations of I. virescens remain to be restudied, and it is not clear to which group it belongs.
Sulphur-bellied Bulbul - It is one of the species of Ixos that might warrant inclusion in the genus Hypsipetes – as long as this is kept separate from Ixos – as it may be a close relative of the Philippine Bulbul , which in turn is closely related to the type species of Hypsipetes, the Black Bulbul .
Philippine Bulbul - The Philippine Bulbul is a songbird species in the bulbul family . It is often placed in the genus Ixos, but is better retained in Hypsipetes as long as this is not entirely merged into Ixos, as it is quite closely related to the type species of Hypsipetes, the Black Bulbul .
Zamboanga Bulbul - It is one of the species of Ixos that might warrant inclusion in the genus Hypsipetes – as long as this is kept separate from Ixos – as it may be a close relative of the Philippine Bulbul , which in turn is closely related to the type species of Hypsipetes, the Black Bulbul .
Streak-breasted Bulbul - The Streak-breasted Bulbul or Mottle-breasted Bulbul is a songbird species in the bulbul family .