"In cities around the world, anti-bird spikes are used to protect statues and balconies from unwanted birds - but now, it appears the birds are getting their own back.

Dutch researchers have found that some birds use the spikes as weapons around their nests - using them to keep pests away in the same way that humans do.

It shows amazing adaptability, biologist Auke-Florian Hiemstra says.

"They are incredible fortresses - like a bunker for birds," he told the BBC."

Tiffany Wertheimer reports for BBC News July 12, 2023. [2]