Sooty-headed Bulbul
Pycnonotus aurigaster
A medium-sized songbird measuring between 18 and 21 centimetres in length with a short crest, the sooty-headed bulbul can be distinguished from the similar red-vented bulbul by its tan front, less extensive area of black on its head and gold-colored vent in certain subspecies. Its call is a series of whistled notes similar in tone to that of the red-whiskered bulbul, but delivered in a more hurried manner.
ID text from Wikipedia, CC BY-SA 4.0
Styan's Bulbul
Pycnonotus taivanus
Styan's bulbul has a very similar appearance to the light-vented bulbul, but they differ in the patterns on the head. Styan's bulbul has a completely black crown with white feathers around its eye, except for a black moustachial stripe below the beak. Hybrids are intermediate between the two species, with the moustachial stripe and white feathers around the eye, but the white feathers extend behind the crown.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Sooty-headed Bulbul and Styan's Bulbul.