The Black Drongo

The Black Drongo (Dicrurus macrocercus), also known as the King Crow, is a small Asian passerine bird of the drongo family Dicruridae. Previously considered a subspecies (Dicrurus adsimilis macrocercus) of the African Fork-tailed Drongo (Dicrurus adsimilis), it is now recognized as a full species. It is a common resident breeder in much of tropical southern Asia from southwest Iran through India and Sri Lanka east to southern China and Indonesia. It is a wholly black bird with a distinctive forked tail and measures 28 cm (11 in) in length. Feeding on insects, it is common in open agricultural areas and light forest throughout its range, perching conspicuously on a bare perch or along power or telephone lines. The species is famous for its aggressive behaviour towards much larger birds, such as crows, never hesitating to dive-bomb any birds of prey that invades its territory. Smaller birds often nest in the well guarded vicinity of a nesting Black Drongo.

The Black Drongo has been introduced to some Pacific islands, where it has thrived and become abundant to the point of threatening and causing the extinction of native and endemic bird species there.

This bird is glossy black with a wide fork to the tail. Adults usually have a small white spot at the base of the gape. The iris is dark brown (not crimson as in the similar Ashy Drongo). The sexes cannot be told apart in the field. Juveniles are brownish and may have some white barring or speckling towards the belly and vent, and can be mistaken for the White-bellied Drongo. First-year birds have white tips to the feathers of the belly, while second-years have these white-tipped feathers restricted to the vent.

They are aggressive and fearless birds, and although only 28–cm (11–in) in length, they will attack much larger species that enter their nesting territory, including crows and birds of prey. This behaviour led to their former name of King Crow. They fly with strong flaps of the wing and are capable of fast manoeuvres that enable them to capture flying insects. With short legs, they sit upright on thorny bushes, bare perches or electricity wires. They may also perch on grazing animals.

They are capable of producing a wide range of calls but a common call is a two note tee-hee call resembling that of the Shikra (Accipiter badius)

The Black Drongo is found predominantly in open country and usually perches and hunts close to the ground. They are mostly aerial predators of insects but also glean from the ground or off vegetation. They are found as summer visitors to northeastern Afghanistan and northern Pakistan but are residents from the Indus Valley until Bangladesh and into India and Sri Lanka. Some populations show seasonal movements that are poorly understood. The Black Drongo can be found in savannas, fields, and urban habitats.

Black Drongos were introduced just before the Second World War from Taiwan to the island of Rota to help in the control of insects. It is believed that they dispersed over the sea to the island of Guam in the 1950s. By 1967, they were the fourth most commonly seen birds in roadside counts on Guam and are today the most abundant bird there. Predation by and competition from Black Drongos have been suggested as factors in the decline of endemic bird species such as the Rota Bridled White-eye and the Guam Flycatcher

Food and foraging

Black Drongo possibly anting, rarely reported but noted in 1937 by T B Fletcher

Black Drongos become active very early at dawn and roost later than many other birds. They feed mainly on insects such as grasshoppers, cicadas, termites, wasps, bees, ants, moths, beetles and dragonflies. They sometimes fly close to tree branches, attempting to disturb any insects that may be present. They congregate in fields that are being ploughed, picking up exposed caterpillars and beetle grubs. As many as 35 birds have been seen at such congregations. They are also attracted to burning grasslands where insects are disturbed. They appear to avoid flies. They associate with Common Mynas, Cattle Egrets and other birds that share a similar diet and habitat. Drongos benefit from this association and are more successful in their foraging. There is only partial overlap in the insect prey sought by mynas and drongos although in rare instances the drongos may rob prey from mynas. It is said that they imitate the call of the Shikra so as to put mynas to flight and then to steal prey. Similar behaviour, using false alarm calls, has been noted in the Fork-tailed Drongo. There are some cases of the Black Drongo preying on small birds, reptiles, or maybe even bats. They have also been on occasion seen feeding on fish Flowers of trees such as Erythrina and Bombax may be visited for water and nectar and they are sometimes known to feed on grains.  They are only rarely known to take larger arthropods such as scorpions and centipedes. They feed on milkweed butterflies that are often avoided by other predators and are known to feed late in the evening or night, often on insects attracted to artificial lights.

Nesting and breeding

 

Nest in West Bengal

Black Drongos breed mainly in February and March in southern India, and until August in other parts of the country. Males and females sing in the mornings during the breeding season. Courtship involves aerobatic chases and they may lock their wings and beaks together, with the pair sometimes falling to the ground. Pair bonds are retained for a whole breeding season. The nest is a cup made with a thin layer of sticks placed in the fork of branch, and is built in a week by both the male and female. Eggs are laid close to the first rains in April. The usual clutch is three or rarely four eggs laid in a cup nest placed in the fork of a outer branch of tree. Large leafy tree such as the Jackfruit are preferred. The eggs are pale cream to red with spots and markings and are 26 mm long (1.05 in) and 19 mm wide (0.75 in). The eggs are incubated by both parents and hatch after 14 to 15 days. Nestlings are brooded for the first five days, after which the young are capable of maintaining a fairly constant body temperature. A second clutch may be laid if the first is destroyed. Nests are sometimes built in telephone poles. A nesting territory of 0.003 to 0.012 km² (0.3 to 1.2 hectares) is maintained.

Helpers, offspring from the previous brood, have sometimes been noted to assist in feeding the fledglings at the nest of their parents. Cases of brood parasitism by the Asian Koel have been noted.An average breeding success of 44% has been noted with the main cause of fledgling mortality being shortage of insect food which in turn was dependent on rainfall.

Mobbing and proximity nesting

 

Their habit of driving away predators from near their nests is believed to encourage other birds such as orioles, doves, pigeons, babblers, and especially bulbuls, to nest in the vicinity.  In one study 18 of 40 nests had Red-vented Bulbuls nesting within 10 metres (33 ft)  An abnormal case of a Red-vented Bulbul feeding the chicks of a Black Drongo at their nest has been recorded.

They are so aggressive that they may sometimes land on large birds of prey and peck them when mobbing.^[ It has been suggested that the Asian Drongo-cuckoo (Surniculus lugubris) has evolved to mimic this species. The intensity of mobbing predators was studied in Java and observations showed that there was a significant increase in mobbing, during the nesting season, of some predators such as the Javan Hawk-eagle but the Black Eagle, a nest predator is mobbed with equal intensity in all seasons. It has been suggested that this strategy may avoid giving away the location of nests during the breeding season.

Growth and development

Fully fledged young yet to develop the forked tail

Young birds have a yellowish-red gape. The feather follicles appear on the fourth day and pin feathers emerge after a week. Nestlings increase in weight steadily until they are 12 days old. The eyes open on the eighth day, the iris reddish-black while the gape turns red. The young leave the nest on the 16 or 17th day. They do not have the fork in the tail until three weeks. The parents continue to feed and protect them for a month. Young birds may beg for food for longer, but are often ignored or chased away by the adults. Birds reach breeding condition in about two years.

Play behaviour has been observed with birds dropping a leaf in the air and catching it in mid-air and these may possibly help young birds acquire aerobatic skills.

In southern India, they moult their feathers from June to October. The wing moult begins in July with the first primary and proceeds towards the tenth. Secondaries are replaced from August after the primaries are at the third quill. The secondary moult is not orderly, the 8th and 7th being dropped earlier than the rest. The tail feathers are moulted centrifugally. Seasonal colour changes in the testicular tissues are caused by variation in melanin synthesis, with the dark pigmentation being lost during the breeding season.

Parasites and diseases

Many ectoparasitic bird lice (Myrsidea spp. and Menacanthus spp.), endoparasitic cestodes and nematodes have been described from this species. However no predators or diseases are significant factors in adult mortality.