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    1. Home
    2. British Trust for Ornithology (BTO)
    bto-logo-portrait

    British Trust for Ornithology (BTO)

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    The British Trust for Ornithology (BTO) is a UK charity that focuses on understanding birds and, in particular, how and why bird populations are changing.

    Recent articles by British Trust for Ornithology (BTO)

    A blue tit perched on a twig. © Philip Croft/BTO
    Birds

    Blue tit guide: how to identify, what they sound like, and what type of nest box they use

    Woodpigeon. © Janne Skinnarla/Getty
    Birds

    Woodpigeon guide: species facts, how to identify, and how they can eat so much

    Dunnock. © Tom Cadwallender/BTO
    Birds

    Dunnock guide: species facts, how to identify, and why they are parasitised by cuckoos

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    House martin, flying with mud in beak for nest building
    Birds

    House martin guide: how to identify, migration and diet

    © John Harding/BTO
    Birds

    Tawny owl guide: how to identify, diet and where to see

    Adult Barn Swallow in Flight, Castilla y Leon, Spain/Credit: Getty Images
    Birds

    Swallow guide: migration, nesting and where to see

    Female pied wagtail. © David Winnard/Getty
    Birds

    Pied wagtail guide: how to identify and species facts

    Male blackbird. © Duncan Shaw/Getty
    Birds

    Common blackbird guide: species facts, how to identify males, females and juveniles

    Male house sparrow. © Edmund Fellowes/BTO
    Birds

    House sparrow guide: species facts, how to identify, and how to put up a nestbox for them

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    Robin (Erithacus rubecula) in spring
    Birds

    European robin guide: diet, habitat and species facts

    Flying-swift_623-f1abf2d
    Birds

    Discover fascinating facts about swifts

    © Graham Catley/BTO
    Birds

    7 bearded tit facts you need to know

    © Allan Drewitt/BTO
    Birds

    6 common tern facts you need to know

    © Chris Knights/BTO
    Birds

    6 nightjar facts you need to know

    Whitethroat - Sylvia communis
    Birds

    6 whitethroat facts you need to know

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