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The spikes were meant to keep birds away. But five corvid nests in Europe use the bird-deterrents as structural support and to ward off predators.
TOBWOLF 12 Pack Bird Spikes, Plastic Fence Spikes for Small Birds Pigeon Squirrel Raccoon, No More Bird Nests & Poop, Pigeon Spikes for Garden Fence Wall Railing Roof - White
HOTBEST 12PCS Bird Repellent Spikes Arrow Pigeon Spikes Fence Kit Anti Bird Fence Pigeon Deterrent Seagull Repeller For Deterring Small Bird Crows and Woodpeckers
Birds have co-opted anti-bird spikes to build nests. Genius! - Vox
Bird-X 10 ft. Original Extra-Wide Stainless Steel Bird Spikes Bird Control EWS-10 - The Home Depot
Crows and magpies using anti-bird spikes to build nests, researchers find, Animal behaviour
Time to end war on birds and find a way to coexist, say experts, Birds
Crows and magpies are using anti-bird spikes to build nests
Bird Spikes, Bird Deterrent Spikes for Squirrel Raccoon Pigeon Animal Defender Spikes Anti Bird Spikes to Keep Birds Away (20 Pack) : Everything Else
Manhattan birds don't give a sh*t about bird spikes : r/pics
How To Install Birds & Pigeon Spikes - HiCare
Birds get revenge by using anti-bird spikes in nests
Birds Repurposing 'Anti-Bird' Spikes to Build Nests, Researchers Say