Europe, Mainland Asia & Africa all have native small cats and so the birds and small mammals have evolved to deal with them, the issue is that in Australia & the Americas they haven’t and so that’s where all the risk of species actually being wiped out is - in the old world the cats largely just replace the larger predators that humans have killed off in the ecosystem
Even in the Americas we have wild cats though. Bobcats are slightly larger but not completely dissimilar. We even used to have ocelots across much of the US, and neotropical migrants will still encounter those for part of the year. So I find the claim that mainland birds are not able to handle cat predation to be a bit questionable. However I am not fully educated on this topic.
That article seems very new-world-centric
Europe, Mainland Asia & Africa all have native small cats and so the birds and small mammals have evolved to deal with them, the issue is that in Australia & the Americas they haven’t and so that’s where all the risk of species actually being wiped out is - in the old world the cats largely just replace the larger predators that humans have killed off in the ecosystem
Even in the Americas we have wild cats though. Bobcats are slightly larger but not completely dissimilar. We even used to have ocelots across much of the US, and neotropical migrants will still encounter those for part of the year. So I find the claim that mainland birds are not able to handle cat predation to be a bit questionable. However I am not fully educated on this topic.