When my current pigeon parents (whose babies are now hearty & almost flying) were building their nest of twigs in front of my office door, I dropped a long piece of soft husk on the ledge for them. They did not use it but left it lying where I'd laid it. Now the nest has turned to a beaten-down black mass, with no individual twigs - except for the piece I left them, which is still laying to the side. The nest was never so well-constructed that an additional bit of material wouldn't have come in handy, but they weren't interested & clearly knew it was an interloping piece.
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