Are cats mass murderers?
Millions of cats roam around outside their home for at least part of the day, and scientists are now looking at what some of them might get up to during the day. Scientists in the UK are claiming that cats kill about five other small animals every year, and they could be killing some really endangered species.
Some experts believe Britain's nine million cats could be killing nearly 150 million birds, mice, rabbits and other creatures every year.
A total of 241 cats from nine different urban areas around Reading are part of the project
And for some small creatures such as the house sparrow - whose numbers are already in decline - cat predation could be a serious threat.
So now scientists are looking at 241 cats to investigate what they get up to when they are not at home.
Cats don't always bring all their prey home, so this tagging is a way to see what they do when they are out on the prowl.
If it is found to be more than about five, scientists estimate that the total kill rate could be about 145 million animals in the UK.
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Nottingham, United Kingdom