Tringa-nebularia, Common Greenshank, Trinil Kaki-hijau

Written by on November 19, 2010 in Bali Bird with 0 Comments

Birds of Bali Seldom Seen

Tringa-nebularia, Common Greenshank, Trinil Kaki-hijau

GreenshaTringa-nebularia, Common Greenshank, Trinil Kaki-hijaunks are among the few waders to eat mainly fish (which makes up one quarter of their diet). They focus on small fish. They also eat prawns, molluscs and insects. During breeding season, they feed mainly on insects.

Greenshanks stalk prey at a steady walk, pecking and probing occasionally. They may dash rapidly through the shallows if they spot a small fish within reach. They feed mainly in shallow water or at the water’s edge, preferring soft mud. They feed both during the day and at night, whenever the tidal situation best suits their hunting style.

Wary birds, Greenshanks may feed alone, or with other waders. Rarely, they may feed in flocks of 20-30, well spread out. However, they roost in large flocks, where available on open ground. At high tide, they prefer to roost on stumps rather than branches in the tree crowns.

Breeding (April-August): Greenshanks nest mainly in taiga and forest zones of the Palaearctic from Scotland, Norway and east across Russia, Siberia to the Bering Sea. Nesting grounds range from moorlands with scattered trees, clearings in coniferous forests, forest marshes dotted with large and small lakes, or treeless upland bogs up to 5,000ft.

The Greenshank male does a switchback display flight, sometimes at great height. Most are usually faithful to their old nesting site and partner, but some males may mate with two females.

Greenshanks nest on the ground, usually next to a piece of dead wood. The nest is shallow hollow lined with grass and other plants. 3-5, usually 4 pale yellowish-green eggs with speckles are laid. These are incubated mainly by the female, particularly if the male has two females. They hatch in 23-24 days. As soon as their feathers dry up, the young disperse away from the nest, hiding among the undergrowth. Usually one parent leaves not long after the eggs hatch, leaving the remaining parent to raise the young. Sometimes, the parents split up the chicks between them, raising them separately. The young fledge in 25-31 days.

Migration: In the winter, Greenshanks migrate to the Mediterranean Basin, Persian Gulf, China, South Africa, India, Indochina, Southeast Asia and even Australia. They winter on a wide range of wetland habitats both coastal and inland, but prefer estuaries to the open coast. In Singapore, Greenshanks are found in mangroves, mudflats, estuaries, sandy shores. Also freshwater wetlands: ponds, reservoirs, canals, rice fields, swamps.

Status and threats: Greenshanks are not endangered because their breeding grounds are extensive, and they breed in a wide variety of habitats.

 

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