1996

Bird Watching (UK) - - 30 Years Of Birdwatching -

Re­sults of a 30-year BTO study showed that corvid num­bers had no ef­fect on small bird num­bers – in­creas­ing num­bers of Mag­pies and Car­rion Crows were put down to the avail­abil­ity of food.

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