Birds are stealing the spikes designed to stop them nesting on buildings and using them to build their own nests - behaviour researchers describe as the 'ultimate adaptation' to city life.
Birds are stealing anti-bird spikes put up by humans - and using them to build their nests.
Researchers from two Dutch natural history museums first came across the phenomenon in a hospital courtyard in Antwerp. Magpies had ripped about 50m of anti-bird spikes from the hospital building and used them to build a huge nest of 1,500 spikes.Biologist Auke-Florian Hiemstra of the Naturalis Biodiversity Centre said the magpies were using the pins in the same way humans do -"to keep other birds away from their nest"."Even for me as a nest researcher, these are the craziest bird nests I've ever seen.
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