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If domestic cats wore bell collars in urban areas the numbers of native birds caught and killed could be reduced by as much as half, a new University of Otago study shows.

Dr. Yolanda van Heezik and Dr. Christoph Matthaei from the Department of Zoology - with Zoology Honours student Jo Gordon - studied cats known by their owners to be prolific hunters.

They asked owners of 37 Dunedin cats to record the number of prey caught and brought back home during a six-week period while wearing a belled collar, and during another six week period without a belled collar.

鈥淲e found that cats caught fewer birds while wearing the belled collar,鈥� Dr. van Heezik says.

鈥淭his study shows it is worthwhile for domestic cats to wear bells and would go some way towards reducing the huge numbers of native birds cats catch. It won鈥檛 eliminate the problem completely, but it鈥檚 a start.鈥�

Previous studies have shown that domestic cats kill tens of thousands of native birds each year in New Zealand.

鈥淧eople might consider cats as a nuisance because they dig in their gardens, or they may be concerned about cats roaming for welfare issues, but people hardly ever think about the impacts cats are having on our native birds.

鈥淢ost cats don鈥檛 catch a lot of prey and they may bring back perhaps only one bellbird a year. But if you consider the large number of domestic cats in towns and cities, then the cumulative impact is likely to be huge,鈥� she says.

In New Zealand urban environments, there are on average 220 domestic cats per square kilometre, and each cat has an average travelling range of about 2.2ha.

In total during the six-week study, the cats not wearing the collar caught 378 animals, including 82 birds. When the cats wore bells, they caught only 41 birds by comparison.