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Likely not just "sitting", but something that sounds similar.

I wonder whether they've measured the RF absorption of pigeon guano in that region of the spectrum.

Pigeon poop has a place in the discovery of the cosmic microwave background: https://medium.com/massivesci/how-the-search-for-bird-poop-h...

My first thought exactly. There's a deep, historical connection between pigeons and microwave antennas. They belong together.

Maybe they are antennas? Maybe they are drones..