Birds often specialize in a particular niche, such as a particular stratum of forest or type of vegetation. In South and Southeast Asia, for example, the mountain tailorbird is often found gleaning in thickets and stands of bamboo, Abbott's babbler gleans lower-storey foliage in lowland forest, the rufous-chested flycatcher and brown fulvetta are birds of the mid-storey forest, the yellow-breasted warbler gleans in the mid- to upper-storey, and the greater green leafbird specializes in the upper-storey forest. The Javan white-eye is a bird of coastal scrub and mangroves, while the related black-capped white-eye is restricted to montane forest.