Well the cat number is cited from a paper and it does pass the sniff test. There's 45 million cats in America so that's 29 - 89 birds/cat/yr. That's not an unreasonable number, even taking into account a power distribution (I would buy that there's cats out there killing several birds a week, as I've seen this with my own eyes). The higher number probably over counts domestic cats though, but that's not too meaningful to my point given how these cats come to existence. Sure, publication doesn't mean absolutely correct, but there's nothing very suspicious about this one that I'm seeing at least. But I didn't do a deep dive either.