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Invasive species the Red-billed Leiothrix also threatens to change Britain's dawn chorus. A new study led by UK Centre for Ecology & Hydrology warns the bird could become as familiar as Ring-necked Parakeets, whose numbers have rapidly increased since becoming established in this country in the 1970s. Dr Richard Broughton, from UKCEH, tells Carrian Jones there have been a cluster of sightings of the Red-billed Leiothrix around Frome. Image: P Mumby