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Indian darter, Oriental Darter, Snakebird, Anhinga melanogaster

The Oriental Darter or Indian Darter (Anhinga melanogaster) is a water bird of tropical South Asia and Southeast Asia. It has a long and slender neck with a straight, pointed bill and, like the cormorant, it hunts for fish while its body is submerged in water. It spears a fish underwater, bringing it above the surface, tossing and juggling it before swallowing the fish head first.

Indian darter, Oriental Darter, Snakebird, Anhinga melanogaster
Snakebird
Ranthambhore, India - January 2016

The body remains submerged as it swims, and the slender neck alone is visible above the water, which accounts for the colloquial name of “Snakebird”. Like the cormorants, it has wettable feathers and it is often found perched on a rock or branch with its wings held open to dry.

Indian darter, Oriental Darter, Snakebird, Anhinga melanogaster
The approximate distribution of the Oriental Darter, according to the IUCN Red List.
By Nrg800 - Own work, CC BY-SA 3.0, Link

Description
The Oriental Darter is like all other anhingas, a cormorant-like species that has a very long neck. The structure of the neck is as in other species of Darter with strongly developed muscles about a kink in the neck at the 8th and 9th vertebrae that allows it to be flexed and darted forward with rapid force to stab fish underwater.

The edges of the commissures of the mandible tips have minute inward pointing serrations that hold impaled fish.

The adult plumage above is black and the wing coverts and tertials having silvery streaks along the shaft. The crown and neck are brown shading to black towards the back of the neck. The underparts are blackish brown. A pale line over the eye and throat and a line running along the sides of the neck gives it a striped appearance. The iris is white with a yellow ring (brighter yellow in breeding birds) around it.

The tip of the upper mandible is dark while the base is pale brown bill while the lower mandible is yellowish. The legs and webbing on the foot are yellow in immatures and non-breeding birds while breeding birds have darker grey tarsi and toes with yellow webbing. The sexes are not easily distinguishable but males tend to have black speckles that coalesce on the white throat.

Adult females have a shorter bill and tend to have the black at the base of neck and chest separated from the hind neck by a wide buff band that ends at the shoulder. This pattern however is also found in immatures whose neck is lighter and lack the long pointed scapulars. In flight the long and slender neck, wide wing and wedge shaped tail make it distinctive.

Young birds have a pale brown neck and appear whitish on the underside and lack the white streak along the side of the neck. The inner secondaries or tertials and the central tail feathers appear wavy or corrugated. The tail is long and made up of twelve stiff feathers which are dragged along the ground when the bird attempts to walk or hop on land.

Measurements
Culmen:    74–90 mm
Wing:    331–357 mm
Tail:    202–240 mm
Tarsus:    42–47 mm
Weight:    1,160–1,500 g

Listen to the Oriental Darter

Remarks from the Recordist

Natural vocalization; one song from a male bird perched on top of a large dead stick at the marshy margin of a large, shallow lake.

www.xeno-canto.org



Taxonomy
The Oriental Darter is a member of the Darter family, Anhingidae, and is closely related to American (Anhinga anhinga), African (Anhinga rufa, with vulsini of Madagascar as a subspecies), and Australasian (Anhinga novaehollandiae) darters. These were for sometime treated as subspecies of Anhinga melanogaster. The Oriental Darter differs in appearance from American darters most recognisably by its white lateral neck stripe.

Behaviour and ecology
The Oriental Darter is found mainly in freshwater lakes and streams. They usually forage singly, with the entire body submerged, swimming slowly forward using their webbed feet while the head and neck is moved jerkily above the water. It darts its neck to impale fish and then brings them out of water, tossing them into the air before swallowing the fish head first.

They may sometimes be found along with cormorants which share the habit of spreading out their wings to dry when perched on a waterside rock or tree. They sometimes soar on thermals during the warm part of the day but will alternate flapping and gliding in normal flight.

Indian darter, Oriental Darter, Snakebird, Anhinga melanogaster
Drying the wings
Bundala National Park, Sri Lanka - May 2017

They nest in mixed species heronries where they build a stick platform on the nest tree which is usually surrounded by water. Several pairs may nest close to each other. The branch is flattened by the birds prior to the placement of the sticks that form the nest platform.

The nest sites are defended from other birds with posturing and thrusts of the neck. The breeding season is June to August (during the rainy season) in northern India, April–May in southwestern India and in winter in southeastern India (during the northeast monsoon).

The usual clutch consists of three to six spindle shaped bluish-green eggs with a white chalky covering that gets soiled over time. Both parents incubate the eggs, beginning after the first egg is laid which leads to asynchronous hatching of the young. The newly hatched chicks are bare and covered with some down on the head. As they grow, they become covered in white down. The chicks feed by thrusting their heads down the throat of their parents.

Adults go through a synchronous moult of their flight feathers after the breeding season, resulting in the loss of flying ability for a brief period. When disturbed from their perches during this period, they dive into the water below and attempt to escape underwater. This escape behaviour is also employed by chicks at the nest.

They are very silent except at the nest where they produce grunts and croaks and a disyllabic chigi-chigi-chigi. Chicks are noisy when begging for food. Adults roost communally in trees close to or over water.

Listen to the Oriental Darter

Remarks from the Recordist

Food begging call by chicks

For more informtion and bird sounds, visit Sharad Apte's web page SongBirds of India. This website presents songs and calls of almost 240 species of birds from India.

www.xeno-canto.org



Chicks, especially those more than half grown are sometimes preyed on by raptors such as Pallas's fish eagle (Haliaetus leucoryphus). The long scapular feathers were once popular for use in decorating hats.

A number of parasites have been recorded from adult birds including Schwartzitrema anhingi (Trematoda), Petasiger nicolli, Mesorchis pendulus, and Echinorhynchotaenia tritesticulata (Cestoda:Dilepididae).

In some parts of northeastern India, darters were (or are) used by tribals to capture fish from streams. A ring is tied around the neck to prevent them from swallowing the prey just as is done with cormorant fishing in parts of Southeast Asia.

Conservation status
Indian darter, Oriental Darter, Snakebird, Anhinga melanogaster
Near Threatened (IUCN 3.1)
IUCN Red List of Threatened Species. Version 2013.2
International Union for Conservation of Nature. Retrieved 26 November 2013.



From Wikipedia, the free encyclopedia
From Wikipedia, the free encyclopedia

www.birdforum.net


Sighted: (Date of first photo that I could use) 18 January 2016
Location: Ranthambhore, India


Among others I have used Peter Ericsson's web page Birds of Thailand These galleries contain 668 species of the Birds of Thailand and have been of a great help to identify some of the birds as the birds in Thailand and India are, well, many of them are the same.

I have had most help from my friend, the bird pal I met at Suan Rot Fai. Sending pictures of birds I have not been able to identify to him via Line. 3 minutes later he and he have managed to identify most of the birds I have had problems with. THANKS! Visit his web page m☥lever for his beautiful pictures.

And my new aid, maybe, and I say maybe the best aid. I brought my mobile phone as my SIM card have stopped working and I tried to get it to work again so I can use the internet. Thus I had my phone in my pocket on my first game drive in Jim Corbett National Park.

We saw a bird and I asked my Guide and the driver if they had a pen and a paper as I had forgot my pen and paper in my room. I remembered my LG phone and I recorded the name. And thus I will always bring my phone. Writing the name in the car and I have found more than once that it can be hard to read what I had wrote when I'm back in my room.

So now I always have my mobile in my pocket and it has been a great help. And from November 2018 I use eBird. Bird watching in U.A.E and Oman and my guide in Dubai recommended eBird and I have used the app since then and I note every bird I can identify in my eBird app.

Indian darter, Oriental Darter, Snakebird, Anhinga melanogaster
Indian Darter or Oriental Darter or Indian Darter
18 January 2016 - Ranthambhore, India

Indian darter, Oriental Darter, Snakebird, Anhinga melanogaster
Oriental Darter or Indian Darter
18 January 2016 - Ranthambhore, India

Indian darter, Oriental Darter, Snakebird, Anhinga melanogaster
Oriental Darter or Indian Darter
18 January 2016 - Ranthambhore, India

Oriental Darter or Indian darter, Anhinga melanogaster, snakebird
Oriental Darter or Indian Darter
22 May 2017 - Bundala National Park, Sri Lanka

Oriental Darter or Indian darter, Anhinga melanogaster, snakebird
Oriental Darter or Indian Darter
22 May 2017 - Bundala National Park, Sri Lanka



PLEASE! If I have made any mistakes identifying any bird, PLEASE let me know on my guestbook



       
                  



                                       

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