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

Birds Are Now Building Nests From Anti-Bird Spikes

10 foolproof ways to defend yourself from the magpie menace - ABC

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Birds Use Spikes in Nests, Outsmarting Humans

Birds Use 'Anti-Bird Spikes' to Make Nests

1942-1943 Peru Pedagogian - issues 1-18 by Peru State College

European Birds Have Been Using Anti-Bird Spikes To Make Nests

European Birds Have Been Using Anti-Bird Spikes To Make Nests

Why Birds Are the World's Best Engineers - The New York Times