The perfect revenge'? Birds are building fortresses from anti-bird spikes

This bird nest becomes a 'fortress' using antibird spikes

Anti Bird Spikes: Crows and magpies use 'anti-bird' spikes around their nests like humans; scientists hail 'ultimate adaptation' - The Economic Times

Time Hatchlings Leave the Nest Could Change Chances of Family's Survival

A binge eating/ADHD connection. Plus, birth control questions answered, ancient monkeys rafted across the Atlantic - National Geographic

Birds get revenge by using anti-bird spikes in nests

Birds get revenge by using anti-bird spikes in nests

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Anti Bird Spikes: Crows and magpies use 'anti-bird' spikes around their nests like humans; scientists hail 'ultimate adaptation' - The Economic Times

National Geographic Editors' Favorite Pictures of Birds

Birds in Europe use anti-bird spikes to fortify nests, researchers say - The Washington Post