light-vented bulbul Pycnonotus sinensis

Common songbird of gardens, parks, and forests. Adult dark olive above, white below, with black-and-white head pattern. Hainan subspecies has a blackish head with white limited to ear patch. Juvenile dull brown above (greenish in wings), white below, lacking head pattern. Hybrids with Styan’s Bulbul appear intermediate, with the moustachial stripe and white feathers around the eye of Styan’s but at least partly white nape of Light-vented. Common song is a ringing series of four notes, “wee-wee-der-wee.”