At present I'm writing an article for a farmer's newspaper. I would like to
touch the issue of the vanishing populations of barnyard swallows (or house
martins) in the landscape. I remember that a few years ago I read somewhere a
research in which they compared the density of these birds at organic farms
with the density at conventional farms. I think it was a research from the UK
or from Germany. Unfortunately I cannot find the article back. Does anybody
know the source of this information?
Greetings and thanks in advance
Jelmer Buys
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