Birds have learned to use our ‘anti-bird’ spikes to protect their own nests: ‘The ultimate adaptation’

Alexander Schippers

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.”