About three years ago, a pair of Yellow-vented Bulbuls (Pycnonotus goiavier) built a nest in one of CK Kim‘s plants from which two chicks fledged. A year age he noticed that another nest was built. Then two weeks ago there was another nesting. And according to CK, there are now three and a half nests in the same small plant.
What this means is that these bulbuls do not recycle their nest material or reuse them.
The nesting bulbuls took turns incubating the eggs but did not remain all the time in the nest, unlike the Pink-necked Green Pigeons (Treron vernans) LINK. The incubating bird left the nest 5-8 times a day, spending about 20 minutes or so away. Came nighttime, it returned and remained in the nest for the night. “But each nite when the sky darkens and noise level comes down, around say 8+pm, she dips her entire head into the nest. So one glance, you won’t know or see the bird,” wrote CK.
Tissue paper appeared to be the favourite nesting material, as seen in the above images. Check this LINK for a Yellow-vented Bulbul’s nest where much more tissue paper is used.