The Greylag Goose (Anser anser) - Indian Bird Videos

Indian birds - Greylag Goose is the largest and bulkiest goose in Anser Species. This Greylag Goose usually mate for life. This Geese is herbivorous and mainly feed on grasses. Greylag geese tend to pair bond in long-term monogamous relationships. Most such pairs are probably life-long partnerships, though 5 to 8% of the pairs divorce and re-mate. Birds in heterosexual pairs may engage in promiscuous behavior, despite the opposition of their mates.

Homosexual pairs are common (14 to 20% of the pairs may be ganders, depending on flock), and share the characteristics of heterosexual pairs with the exceptions that the bonds appear to be closer, based on the intensity of their displays. Same-sex pairs also engage in courtship and sexual relations, and often assume high-ranking positions in the flock as a result of their superior strength and courage, leading some to speculate that they may serve as guardians of the flock. The orientations of the birds are generally flexible, as more than half of widowers re-pair with a bird of the opposite sex.

The nest is on the ground among heather, rushes, dwarf shrubs or reeds, or on a raft of floating vegetation. It is built from pieces of reed, sprigs of heather, grasses and moss, mixed with small feathers and down. A typical clutch is four to six eggs, but fewer eggs or larger numbers are not unusual. The eggs are creamy-white at first but soon become stained, and average 85 by 58 millimetres (3.3 by 2.3 in). They are mostly laid on successive days and incubation starts after the last one is laid. The female does the incubation, which lasts about twenty-eight days, while the male remains on guard somewhere near. The chicks are precocial and able to leave the nest soon after hatching. Both parents are involved in their care and they soon learn to peck at food and become fully-fledged at eight or nine weeks, about the same time as their parents regain their ability to fly after moulting their main wing and tail feathers a month earlier. Immature birds undergo a similar moult, and move to traditional, safe locations before doing so because of their vulnerability while flightless.

Location : Keoladeo National Park, Rajasthan.

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