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You'd ask yourself just how diverse the wildlife in an urban environment is, where the bulk of domestic cats live. Right now I'm not convinced about the ecological impact.

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There are over 250 species of bird present for at least part of the year in the city where I live, which has a population of 880000.

Rats with wings

He said "birds" not "bats". If you're going to be snarky, at least get the classification right.

He's talking about pigeons.

He may have been referring to pigeons. Rats with wings is an apt metaphor.

Pigeons only account for one of those 200+ species the OP mentioned though (unless they live in one of those regions with the native Band-Tailed Pigeons). That particular kind of pigeon that everyone loathes (European Rock Pigeons) aren't even native to the New World and are an evasive species.

Ironically, they're in the decline in their natural habitat while thriving in North/South America. The Americas has a few native pigeons, but none are as well known or wide spread as the Rock Pigeon. Quite a few pigeon species are also far from the ugly "rats with wing" stereotype[1], but they don't live in Europe or North America.

[1] https://en.wikipedia.org/wiki/Victoria_crowned_pigeon

Cat's don't just live in urban environments. The article says most of the damage is done by ferals.

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