Birds are stealing anti-bird spikes put up by people - and utilizing them to construct their nests. 

Researchers from two Dutch pure historical past museums first got here throughout the phenomenon in a hospital courtyard in Antwerp.

Magpies had ripped about 50m of anti-bird spikes from the hospital constructing and used them to construct an enormous nest of 1,500 spikes.

Anti-bird spikes are sometimes put in on buildings to discourage birds from nesting there.

Biologist Auke-Florian Hiemstra of the Naturalis Biodiversity Centre stated the magpies have been utilizing the pins in the identical approach people do - "to keep other birds away from their nest".

"It's like a joke, really," he stated.

"Even for me as a nest researcher, these are the craziest bird nests I've ever seen."

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Magpies will make a roof on their nest to guard their eggs and younger, and can typically use thorny branches.

But within the metropolis, anti-bird spikes provide an city different.

The researchers described the behaviour because the "ultimate adaptation to life in the city".

The analysis - revealed in Deinsea, the annual of the Natural History Museum in Rotterdam - describes comparable magpie nests discovered within the Netherlands, Belgium and Scotland.

Crows have additionally been discovered making nests with the spikes within the Netherlands.

It's not the primary instance of unhospitable objects getting used for birds' nests.

Other sharp supplies, together with barbed wire and knitting needles, are additionally utilized by magpies for the roof of their nests.