One on the left preens itself as the other on the right flies away and returns, Black-crested Bulbul Rubigula flaviventris

birds passeriformes passerine branch perch insectivores insectivorous wings feathers national parks wildlife nature forest feather ornithology green black feathers conservation black tail flying bill foraging folliage thailand tropical insect feeders jungle insectivore trees foliage blackcrested bulbul rubigula flaviventris rubigula yellow habitat natural windy afternoon crest feeding