Geographic Range
Greater racket-tailed drongos are found throughout Southeast Asia. They are found
in India, east of Bangladesh and south of the Himalayas. They are also found in southern
China, on the island of Hainan, and in parts of Indonesia.
Habitat
Greater racket-tailed drongos inhabit a wide variety of habitats. They can be found
in moist deciduous forests, in the low hills of the Himalayas and also in wide-open
plains. Populations are most dense in the foothills of the Himalayas. They can be
found from sea level to 2,000 meters.
- Habitat Regions
- tropical
- terrestrial
- Terrestrial Biomes
- forest
- rainforest
- mountains
Physical Description
Greater racket-tailed drongos can weigh from 70 to 125 grams and are 31 to 36 centimeters
in body length, not including their elongated tail feathers. Males and females are
similar in appearance. The body is glossy black with shades of blue and green. The
blue extends from behind their reddish-brown eyes to about halfway down the back.The
wings and the tuft on the top of the head are green with a hint of pale yellow on
the very tips of the wings. Greater racket-tailed drongos have two wirelike ‘racket’
tipped feathers that extend beyond the tail.
- Other Physical Features
- endothermic
- homoiothermic
- bilateral symmetry
- Sexual Dimorphism
- sexes alike
Reproduction
Greater racket-tailed drongos form monogamous pairs during breeding season. There
is some evidence that young help with raising subsequent broods as well.
- Mating System
- monogamous
Greater racket-tailed drongos breed from March to June but there is quite a bit of
variation in the breeding season in different localities. Birds found in the northern
parts of their range tend to mate much later in the season, between June and July.
Populations in more southern, tropical regions tend to mate much earlier, around February.
The nests of greater racket-tailed drongos are saucer-like in shape. They are made
of intricately intertwined roots and leaves with fine materials lining the inside.
They are held together with cobwebs and camouflaged with lichens. The nests are often
found at a horizontal fork of two branches. Greater racket-tailed drongos tend to
lay 3 to 4 eggs.
- Key Reproductive Features
- iteroparous
- seasonal breeding
- gonochoric/gonochoristic/dioecious (sexes separate)
- sexual
- oviparous
Nesting duties, constructing the nest, incubation, and rearing young are shared between males and females. Males and females also continue to watch over their young even after they leave the nest.
- Parental Investment
- altricial
-
pre-fertilization
- provisioning
-
protecting
- female
-
pre-hatching/birth
-
provisioning
- female
-
protecting
- male
- female
-
provisioning
-
pre-weaning/fledging
-
provisioning
- male
- female
-
protecting
- male
- female
-
provisioning
-
pre-independence
-
provisioning
- male
- female
-
protecting
- male
- female
-
provisioning
- post-independence association with parents
Lifespan/Longevity
The lifespan of greater racket-tailed drongos is not known.
Behavior
Greater racket-tailed drongos can normally be found in hunting groups that are made
up of other bird species, mainly jungle babblers (
Timaliidae
). They are usually observed along, in pairs, or in small groups. They are very territorial.
Greater racket-tailed drongos have a style of flight similar to that of other drongos
(
Dicruridae
), which includes a lot of dipping with short spurts of flapping followed by a period
of gliding. The ‘rackets’ on the end of the tail make the bird’s flight excessively
noisy and make a persistent humming noise.
Home Range
The home range of greater racket-tailed drongos is not known.
Communication and Perception
Greater racket-tailed drongos have a large repertoire of calls that consist of bell-like
notes, whistles, warbles, and metallic sounding calls that are typical of most drongos.
Greater racket-tailed drongos are convincing mimics, which is useful when traveling
in the mixed hunting flocks in which they are usually found.
- Other Communication Modes
- mimicry
Food Habits
Greater racket-tailed drongos feed on the nectar of plants but also eat insects including
ants, bees, beetles, dragonflies, locusts, mantids, moths, and termites. Like other
drongos, they catch their prey in mid-air or pick them off of surfaces, and then carry
prey back to the nest in their claws.
- Animal Foods
- insects
- Plant Foods
- nectar
Predation
Predation on greater racket-tailed drongos has not been reported, although it is likely that a variety of arboreal predators, such as snakes, prey on eggs, nestlings, and young.
Ecosystem Roles
Greater racket-tailed drongos act as predators in the ecosystems they inhabit by preying
on a multitude of insects. They are also capable of pollinating plants because they
feed on nectar.
- Ecosystem Impact
- pollinates
Economic Importance for Humans: Positive
Greater racket-tailed drongos are important members of native ecosystems, but otherwise
have no known economic importance for humans.
Economic Importance for Humans: Negative
Greater racket-tailed drongos have no negative impact on human society.
Conservation Status
Greater racket-tailed drongos are not currently considered threatened.
Additional Links
Contributors
Tanya Dewey (editor), Animal Diversity Web.
Patrick Maloney (author), Kalamazoo College, Ann Fraser (editor, instructor), Kalamazoo College.
- oriental
-
found in the oriental region of the world. In other words, India and southeast Asia.
- native range
-
the area in which the animal is naturally found, the region in which it is endemic.
- tropical
-
the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south.
- terrestrial
-
Living on the ground.
- forest
-
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
- rainforest
-
rainforests, both temperate and tropical, are dominated by trees often forming a closed canopy with little light reaching the ground. Epiphytes and climbing plants are also abundant. Precipitation is typically not limiting, but may be somewhat seasonal.
- mountains
-
This terrestrial biome includes summits of high mountains, either without vegetation or covered by low, tundra-like vegetation.
- endothermic
-
animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.
- bilateral symmetry
-
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
- monogamous
-
Having one mate at a time.
- iteroparous
-
offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).
- seasonal breeding
-
breeding is confined to a particular season
- sexual
-
reproduction that includes combining the genetic contribution of two individuals, a male and a female
- oviparous
-
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
- altricial
-
young are born in a relatively underdeveloped state; they are unable to feed or care for themselves or locomote independently for a period of time after birth/hatching. In birds, naked and helpless after hatching.
- arboreal
-
Referring to an animal that lives in trees; tree-climbing.
- diurnal
-
- active during the day, 2. lasting for one day.
- motile
-
having the capacity to move from one place to another.
- sedentary
-
remains in the same area
- solitary
-
lives alone
- territorial
-
defends an area within the home range, occupied by a single animals or group of animals of the same species and held through overt defense, display, or advertisement
- social
-
associates with others of its species; forms social groups.
- visual
-
uses sight to communicate
- acoustic
-
uses sound to communicate
- mimicry
-
imitates a communication signal or appearance of another kind of organism
- carnivore
-
an animal that mainly eats meat
- insectivore
-
An animal that eats mainly insects or spiders.
- herbivore
-
An animal that eats mainly plants or parts of plants.
- nectarivore
-
an animal that mainly eats nectar from flowers
- visual
-
uses sight to communicate
- tactile
-
uses touch to communicate
- acoustic
-
uses sound to communicate
- chemical
-
uses smells or other chemicals to communicate
References
Ali, S. 1941. The Book of Indian Birds . Oxford, England: Oxford University Press.
Roberts, T. 1992. The Birds of Pakistan . Karachi: Oxford University Press.
2005. Grzimek's Animal Life Encyclopedia . The Gale Group. Accessed October 16, 2006 at http://www.answers.com/topic/greater-racket-tailed-drongo .