Asynchronous Hatching, Fratricide and Double Clutches in the Marsh Harrier

A brood of four nestling Marsh Harriers Circus aeruginosus hatched over approximately seven days. When the three older nestlings were banded, the fourth and youngest was one quarter of the weight of the next older nestling. The youngest nestling was killed and eaten by its siblings during a period of food shortage. One female and one male nestling fledged when 46 and 43 days old respectively. Evidence for double clutching in Swamp Harriers is critically reviewed.

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