In the courtyard of a hospital in the city of Antwerp in Belgium, a patient discovered something strange in a huge bird nest.
High up in a tree, magpies had made a huge nest using up to 1,500 metal spikes, building what scientists describe as “an impregnable fortress.”
Dutch biologists who analysed the nest say the birds may have pulled as many as 50m (150ft) of anti-bird pins from the eaves, and appear to have used them exactly the same way we do:…
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News Source: www.independent.co.uk