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This is scientific Americans 60 second science. I'm Jason Goldman. Domestic cats that live or go outside kill lots of wild animals.

Recent studies find that outdoor cats in North America take out between 10 and 30 billion birds and mammals each year.

Still, it hasn't been clear what kind of an impact the world's 600 million pet cats have on wildlife populations,

and whether that impact poses a threat to biodiversity conservation.

Anyone who has a cat sees their cats bring animals home and the question is well does

it matter and especially we wanted to know, where are the cats actually hunting?

Are they hunting in their backyards?

Or are they going out into the nature preserves?

North Carolina State University's dualogist Roland Kays.

Together with colleagues in the UK, Australia, and New Zealand,

Kays distributed small GPS trackers

to citizen scientist cat owners. They attached the trackers to their cat's collars.

In all, more than 900 pet cats were tracked this way, all of which were routinely allowed to roam freely outside.

Some cats were true explorers.

One British cat called Max, walked almost two kilometers back and forth

along a road between two neighboring villages, twice.

But the majority were homebodies, rarely straying more than a hundred meters from home.

In other words, they used their own backyards, plus those of a few neighbors, as their hunting grounds.

The findings are in the journal Animal Conservation.

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