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Cat photo courtesy of Shutterstock

As a gardening veterinarian, I feel obligated to defend our feline friends against the recent onslaught of poor publicity directed towards them.  I’m referring of course, to news reports that stem from a January 29, 2013 article by Scott Loss, et al in Nature Communications, titled “The impact of free-ranging domestic cats on wildlife of the United States”.

As a scientist, I’d love to tell you that I carefully examined the data collection methods and statistics presented in the paper, but Nature Communications is one of those journals who publish manuscripts, usually for a fee, from authors (who are themselves required to publish or perish from their respective academic jobs) and then Nature Communications turns around and charges everyone else to read those articles, with no kick-back to the authors or the source of research funds for the study.  I believe the for-profit-motivated proliferation of such firms is largely responsible for most of the hastily-completed and poorly-controlled bad science being published today.  Although I am at the mercy of this professor-prostituting racket myself, I refuse to pay good money for publishers to make profits off what should be globally-available information, so I have read only the original abstract and seen other data second-hand in news reports.

Setting aside that minor rant, Loss’s paper estimates, not from their own research but by an analysis of other published studies measuring kill rates in urban and rural environments, and by using other various extrapolations and predictions of cat, bird, and small mammal populations, that “free-ranging domestic cats kill 1.4–3.7 billion birds and 6.9–20.7 billion mammals annually.”  In other words, these authors take a whole bunch of assumptions, apply specific data sets to broader populations, and come up with some numbers that could be off by orders of magnitude if their assumptions are in error.  Not to mention any possibility of bias from authors who are all either employed by the Migratory Bird Center of the Smithsonian, or the Division of Migratory Birds of the U.S. Fish And Wildlife Service.  Personally, I’d like to see a little more research about unanticipated impacts before we see a massive Federal program created from taxpayer money to trap, neuter, and relocate cats.

I’m willing, however to set those concerns aside and allow for the fact that domestic cats may kill around 3 billion birds and 20 billion small mammals annually.  I don’t believe it, but if I accept the premise, then my response is still, “so what?”   And for the cats, “Good on ya!”   Twenty billion dead mice means twenty billion less roses that have canes chewed away, twenty billion less rats eating seed from my bird feeders and corn from my garden, and twenty billion less snakes in my garden that would have proliferated to eat the mice if the cats didn’t.   I’m sorry about the birds, but folks, that’s the nature of a Darwinist environment.  There’s a whole lot of killing going on out there in nature.  If the majority of those 3 billion birds are starlings and urban pigeons, then I’m not really very alarmed.  Millions of cats die annually as well, killed by cars and coyotes and domestic dogs and human psychopaths.   Yes, I am aware that cats have been responsible for the extinction of specific island bird species.  So have snakes, and both predators were introduced to those islands by Man, blundering around in our usual stupid fashion.  Man, in fact, has been responsible for the extinction of many more species than the domestic cat, so perhaps we should talk about limiting our own numbers before we throw stones at the cats.  Put a new predator in an environment where the prey don’t have time to adapt before they are eliminated, and extinction happens.  Ask just about any species group, including some native human populations.

Regardless, my personal experiences are directly opposed to the findings of the Loss study.  I have a cat in my garden, a calico named “Patches” by my imaginative children, who is a most efficient mouser.  I find almost daily presents of prairie mice remains on my doorstep, but I never once have seen that cat catch a bird nor have I found the organic remnants of such an attack.  Even the fat little ground-dwelling quail endemic to this area seem to be able to escape the clutches of my supposedly super-lethal cat.  I’m left, therefore, in a quandary, wondering where exactly the evidence of the slaughter is?  And in the meantime, I’m searching for a couple of more cats to live in an under-construction barn.  I would, personally, rather find more mouse parts strewn around the barn floor than find the snakes that would otherwise be hunting for the mice, so if it comes to a choice between having barn pigeons and having cats, the barn pigeons are just going to have to toughen up.

Posted by

James Roush
on February 14, 2013 at 8:34 am, in the category Guest Rants, Ministry of Controversy.


  1. Interesting post. As the neighbor of a wandering cat, I often found “presents” of dead birds and I can attest that they were of the slower kind–mostly mourning doves. What I also found, however, were other birds–cardinals, finches, robins and other songbirds–dead of strikes agains my windows despite my precautions of putting decals there.

  2. wow, what an awful commentary. Killing a cat, for killing birds. Really?? Are you going to go out and kill the birds that kill other birds then? Yes, that does happen, killing and destroying eggs…and some birds of prey who kill other birds…..not to mention all the other preditors out there just doing what they do. I totally agree, cats should not be left to roam about if they are domestic…I have had cats…have 2 now…and NEVER let them roam…for many reasons, I love my cats and dont want people like you getting ahold of them…..I dont want them peeing and pooping in peoples yards n flower beds…etc….not cool……when they are outside, I am outside to keep them in our yard….they have caught a few mice, and one bird in the many yrs Ive had them….I prefere they not kill at all, but certainly am not going to justify killing a cat just because its doing what its programed to do. Hmmmm we dont like them killing birds…so we kill the cat….ok :/ sounds like a case of a cat hater, rather than someone trying to do the right thing…..fyi I am a bird lover as well….we feed the birds….actually, I am an animal lover….but also realize they dont always behave the way us humans to or think they should…they are animals…..

  3. Don’t get me wrong…having read the full article, the authors made a fine attempt; they just have little in the area of solid data to base it on and they make a huge number of extrapolations. And I’m not against the conclusions regarding feral cats. I believe, however in unanticipated consequences. Take away the cats and I’m quite sure the snakes and other predators (coyotes) would expand to fill the niche. That’s the way Nature works.

  4. The cat cam in question was part of the University of Georgia study of 60 house cats allowed to roam. They found that the cats killed more frequently than previously believed and only bring back a quarter of their kills.

  5. I found the information by searching “University of Georgia, cat, cam”. Did you look at the data? 55 cats killed 39 animals TOTAL over 7 days of filming (average 37 hours of film). Only 5 of the 39 were birds.

  6. I suggest you visit the website of the ‘cat-cam’ researcher. There, you will discover that she states quite clearly that the MINORITY of studied cats caught anything at all, and, of that group, only SOME caught and killed birds. It is hardly a definitive study, although I think she has a great dissertation topic. Seriously, it’s a fun website to visit and it’s easily found with a google search.

  7. Well said James! Although I know that the various strays that have visited my garden over the past decade *have* killed birds and small rodents, I don’t believe it’s made any significant difference in populations in my neighborhood. I won’t believe any published estimates unless I’ve seen all of the details either.

  8. I’m a dog person so I’m on the fence about this. There is a huge decline in songbirds, and it seems to me that if this study has teeth it could be backed up through field studies or experiments.

  9. Oh, thanks to Elizabeth Licata, I was finally able to read the entire paper. I’m checking up on some of the references now and I’m also confused by the probability distributions; because there is a paucity of studies in the US, the authors used some estimates in three groups; US studies, US and European Studies, and “all temperate zone studies”. Interestingly, the minimums and maximums for figures using the former two groups are often broader than the “all temperate zone groups”….which should include the US and European studies, so the “all temperate studies” should be the wider ranges…I need to figure out that discrepancy.

  10. Sorry to say, mine could. I saw it with my own eyes, dead hummingbird in its mouth, the hummingbird’s tongue hanging from its beak. That was the nail in the coffin for me, no matter how many nuisance mice/rats it cleaned up. No more cats now that that one has passed on.

  11. I’VE caught a hummingbird, in fact much more than once, which I do when they manage to fly into the house and need to be removed. If I can do it, it’s can’t be hard for a lethal feline predator, e.g. if the hummer is zooming low to get a taste of a low hanging flower.

  12. As we live in a Darwinian world, I assume our commenter has no objection whatsoever to me shooting the cats that come into my yard and prey upon my songbirds, as that is, after all, simply the way of nature.

  13. Okay, I’ll add to the controversy and say, “No, I’ve got no trouble with that”. Wild cats are wild animals and sometimes pests, regardless of how much they look like our beloved extra family members.

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