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> As in, orders of magnitudes below the next higher causes, which are mostly wild cats and pesticides

I'm not sure if you're aware, wild cats are a direct result of domestic cats.

Perhaps they meant European wildcats[1], not feral cats. [1] https://en.wikipedia.org/wiki/European_wildcat

This is backward, the domestic cat is a descendent of the Eurasian wildcats.

A substantial number of the wild cats in Europe are feral, but so what. Same cat, same niche, same place.