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Keeping Cats Indoors Could Blunt Adverse Effects to Wildlife

Cat with GPS tracking device on collar.
House cats have a large and detrimental effect on local wildlife, according to a new study that tracked domestic cat movement and counted cat prey.

For Immediate Release

Birds alighting on driveways and baby bunnies munching on lawn grass should keep something in mind: Beware the house cat.

A new study shows that hunting by house cats can have big effects on local animal populations because they kill more prey, in a given area, than similar-sized wild predators. This effect is mostly concentrated relatively close to a pet cat’s home, since most of their movement was a 100-meter radius of their homes, usually encompassing a few of their neighborhood’s yards on either side.

Researchers from NC State University and the North Carolina Museum of Natural Sciences collaborated with scientists and citizen scientists from six countries to collect GPS cat-tracking data and prey-capture reports from 925 pet cats, with most coming from the U.S., U.K, Australia and New Zealand.

“Since they are fed cat food, pets kill fewer prey per day than wild predators, but their home ranges were so small that this effect on local prey ends up getting really concentrated,” said Roland Kays, the paper’s lead author. “Add to this the unnaturally high density of pet cats in some areas, and the risk to bird and small mammal population gets even worse.

“We found that house cats have a two- to 10-time larger impact on wildlife than wild predators – a striking effect,” he said.

Roland Kays describes the domestic cat research.

The researchers focused on the ecological impact of house cats – as opposed to feral cats – and enlisted hundreds of pet owners to track their cats to see where they went and report on the number of dead critters they brought home. Inexpensive GPS tracking devices measured distances traveled by these house cats, which spent their days both indoors and outdoors.

“We knew cats were killing lots of animals – some estimates show that cats in North America kill from 10 to 30 billion wildlife animals per year – but we didn’t know the area in which that was happening, or how this compared with what we see in nature,” Kays said.

The researchers calculated the amount of prey killed per year by house cats and divided the number by the area in which the cats hunted. Some adjustments were made to the prey count as cats don’t necessarily bring all their kills home.

The study showed that house cats killed an average of 14.2 to 38.9 prey per 100 acres, or hectare, per year.

The study also showed that cats do much of their damage to wildlife in disturbed habitats, like housing developments.

“Because the negative impact of cats is so local, we create a situation in which the positive aspects of wildlife, be they the songs of birds or the beneficial effects of lizards on pests, are least common where we would appreciate them most,” said study co-author Rob Dunn, William Neal Reynolds Distinguished Professor of Applied Ecology at NC State. “Humans find joy in biodiversity, but we have, by letting cats go outdoors, unwittingly engineered a world in which such joys are ever harder to experience.”

NC State’s Arielle W. Parsons and Brandon Mcdonald co-authored the paper. Other co-authors include Troi Perkins from Dartmouth College; Shelby Powers from East Carolina University; Leonora Shell from SciStarter; Jenni L. McDonald and Holly Cole from University of Exeter; Heidy Kikillus and Lisa Woods from Victoria University of Wellington; and Hayley Tindle and Philip Roetman from the University of South Australia.

Note to editors: An abstract of the paper follows.

“The small home ranges and large local ecological impacts of pet cats”
Authors: Roland Kays, Robert R. Dunn, Arielle W. Parsons and Brandon Mcdonald, North Carolina State University; Troi Perkins, Dartmouth College; Shelby Powers, East Carolina University; Leonora Shell, SciStarter; Jenni L. McDonald and Holly Cole, University of Exeter; Heidy Kikillus and Lisa Woods, Victoria University of Wellington; Hayley Tindle and Philip Roetman, University of South Australia

Published: March 11, 2020 in Animal Conservation

DOI: 10.1111/acv.12563

Abstract: Domestic cats are a conservation concern because they kill billions of native prey each year, but without spatial context the ecological importance of pets as predators remains uncertain. We worked with citizen scientists to track 925 pet cats from six countries, finding remarkably small home ranges (3.6 – 5.6 ha). Only three cats ranged >1 km2 and we found no relationship between home range size and the presence of larger native predators (i.e. coyotes, Canis latrans). Most (75%) cats used primarily (90%) disturbed habitats. Owners reported that their pets killed an average of 3.5 prey items/month, leading to an estimated ecological impact per cat of 14.2-38.9 prey ha-1 yr-1. This is similar or higher than the per-animal ecological impact of wild carnivores but the effect is amplified by the high density of cats in neighborhoods. As a result, pet cats around the world have an ecological impact greater than native predators but concentrated within ~100m of their homes.

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  1. This is the most ridiculous, unscientific study ever published. First you have 3 very different countries which alone would nullify any scientific conclusion. Than you have 386 people per km density? LOL What kind of backwoods study is this? Even Raleigh, NC where this study was done is 1,037 people per km. If you wanted to make this study complete you should of tracked urban coyotes and I’m guessing they are killing way more that 3.5 prey a month.

  2. what species of birds are being taken? in Western Colorado practically the ONLY birds in town are House Sparrows, Starlings, Pigeons, and Collard Doves, the first three being total pests, driving out native species- I hardly ever even see a Robin in town! I just retired as the Roofer for the school district and can verify that Pigeons are stinking, disgusting, and out of control when nesting on roofs- they love to nest under solar panels and their shit builds up to gross levels; House sparrows and Starlings aren’t as bad only because they’re smaller.

    1. Typical cat person deflection response.
      Pretty much most birds, and other valuable native species are being taken.
      Invasive birds need to be controlled too, doesn’t mean anything what you said, except that you have problems where you live, that need addressing too.

  3. “Cats should be outdoors, they are not doing any harm!” idiots in the comments in 3… 2… 1….

    Tell that to the ~ 4 billion (with a B) small mammals and rodents killed every year by domestic and feral cats EVERY year in the USA alone…

    And yes, windmills (~100k), cell phone towers and related (~ 4 million), etc, etc kill birds every year as well…. but NOT like cats, so leave those spurious arguments behind please…

    KEEP THEM INDOORS for your sake AND theirs 🙂