Black bulbul
The black bulbul ("Hypsipetes leucocephalus"), also known as the Himalayan black bulbul or Asian black bulbul, is a member of the bulbul family of passerine birds. It is found primarily in the Himalayas, its range stretching from India eastward to Southeast Asia. It is the type species of the genus "Hypsipetes", established by Nicholas Aylward Vigors in the early 1830s. There are a number of subspecies, mostly varying in the shade of the body plumage which ranges from grey to black, and some also occur in white-headed morphs, as also suggested by its specific epithet "leucocephalus", literally  white head. The legs and bill are always rich orange-red. Taxonomy and systematics. The black bulbul was originally described in the genus Turdus and has also been considered as either conspecific with or as subspecies of the Malagasy bulbul. The common name 'black bulbul' is also used as an alternate name by the Malagasy bulbul. Formerly, the square-tailed bulbul was also classified as two subspecies of the black bulbul. Subspecies. Ten subspecies are currently recognized, although the reproductive isolation mechanisms such as vocalization and geographic distributions of these populations still remain to be studied: Description. The black bulbul  is in length, with a long tail. The body plumage ranges from slate grey to shimmering black, depending on the race. The beak, legs, and feet are all orange and the head has a black fluffy crest. Sexes are similar in plumage, but young birds lack the crest, have whitish underparts with a grey breast band, and have a brown tint to the upperparts. They have a black streak behind the eye and on the ear coverts. Although males and females are indistinguishable to the human eye, there are significant differences in the ultraviolet reflectivity of the plumage making them  readily distinguishable to the bulbuls themselves. Vocalisations. They can be quite noisy, making various loud cheeping, mewing and grating calls. The Himalayan form has been reported to make a call resembling a goat kid, throwing back its neck when calling. Distribution and habitat. This bulbul is found in broad-leaved forests, cultivation and gardens mainly in hilly areas, but Himalayan populations are known to sometimes descend into the adjoining plains in winter. Breeding. It builds its nest in a tree or bush; the nest is a cup placed in a fork and made from grasses, dry leaves, mosses, lichens and  cobwebs. The lining is made up of ferns, rootlets and other soft material. Both sexes participate in nest construction. Two or three eggs form the usual clutch. Food and feeding. Black bulbuls feed mainly on seeds and insects, and they are often seen in small groups, either roosting or flying about in search of food. They are particularly fond of berries. They are known to feed on a wide range of berries including "Celtis", "Rosa", "Melia" and "Ehretia" in the Himalayas. They feed on the nectar of "Salmalia", "Erythrina", "Rhododendron" and other species. They make aerial sallies for insects. Black