Some birds are using antibird spikes to build their nests

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.

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PDF) Bird nests made from anti-bird spikes

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Crows and magpies are using anti-bird spikes to build nests

Researchers Find That Birds Are Using Anti-Bird Spikes to Build and Protect Their Own Nests

Bird Spikes, Bird Deterrent Spikes for Squirrel Raccoon Pigeon Animal Defender Spikes Anti Bird Spikes to Keep Birds Away (20 Pack) : Everything Else

They're Outsmarting Us': Birds Build Nests from Anti-Bird Spikes - The New York Times

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They're Outsmarting Us': Birds Build Nests from Anti-Bird Spikes