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In page Heron:

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The herons are a highly mobile family, with most species being at least partially migratory. Some species are partially migratory, for example, the grey heron, which is mostly sedentary in Britain, but mostly migratory in Scandinavia. Birds are particularly inclined to disperse widely after breeding, but before the annual migration, where the species is colonial, searching out new feeding areas and reducing the pressures on feeding grounds near the colony. The migration typically occurs at night, usually as individuals or in small groups.[1]