Black-crested Bulbul
Rubigula flaviventris
The black-crested bulbul is 18.5–19.5 cm in length. The head is black with a distinct crest and a yellow iris, while the rest of its body is greenish yellow above and yellow below, and a greenish-black tail. The bill and the feet are black. In the subspecies R. f. johnsoni, the throat is red. Both the male and female are similar in plumage; young birds are slightly duller.
ID text from Wikipedia, CC BY-SA 4.0
Flame-throated Bulbul
Rubigula gularis
The flame-throated bulbul is about 18 cm long with an olive-green back and yellow underparts, a squarish black head without a crest, an orange-red throat. The iris is white and contrasts with the dark head. The legs are brown and the gape is yellowish-pink. The bill is dark brown to black. The plumage of young birds has not been described.
ID text from Wikipedia, CC BY-SA 4.0

Where you might meet both
Learn this pair in the BeakBrain App
Photo and call practice. Coming soon to iPhone and Android.
Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Black-crested Bulbul and Flame-throated Bulbul.