Feral cats kill 316 million birds and pet cats kill 61 million birds in Australia every year. This equates to cats killing more than 1 million Australian
birds every day. More than 99% of these casualties are native birds.
These are some of the findings of recently published research by a group of Australian environmental scientists.
The estimates are based on results from nearly 100 studies across the country, each sampling cat density, and another set of nearly 100 studies across the country that assessed cat diet.
Lead researcher Professor John Woinarski said that while previous research has looked at the impact cats are having on Australia’s mammals, this is the first nation-wide assessment of the impact of cats on Australia’s birds.
“Everyone knows that cats kill birds, but this study shows that, at a national level, the amount of predation is staggering, and is likely to be driving the ongoing decline of many species,” explains Professor Woinarski, from Charles Darwin University.
The study also found that the highest rates of cat predation on birds is on Australia’s islands and in remote arid Australia, where the number of birds killed by cats each year can reach 330 birds per square kilometre.
In a second study the research team also looked at which bird species are at most risk from cat predation. They found records of cats killing 338 native bird species – almost half of Australia’s native bird species. This included 71 threatened bird species.
“We found that the birds most likely to be killed by cats are medium sized birds, birds that nest and feed on the ground, and birds that occur on islands or in woodlands, grasslands and shrublands.”
“For Australian birds, cats are a long-standing, broad-scale and deeply entrenched problem that needs to be tackled more effectively” Professor Woinarski said.
Australia’s Acting Threatened Species Commissioner, Sebastian Lang, said “This evidence is extremely important, and of great concern.
“Our knowledge of the impacts of cats on threatened mammals was a major stimulus for our first-ever national Threatened Species Strategy, which prioritised actions to control feral cats,” Mr Lang said.
“This new research emphasises the need to continue working to reduce the impact of cats on our native biodiversity.
“The number of birds killed by pet cats is also high, but I would like to commend pet owners who are containing their cats instead of letting them roam freely,” Mr Lang said.
The research was undertaken by the Threatened Species Recovery Hub of the National Environmental Science Programme. The Hub is a collaboration of 10 leading Australian universities and the Australian Wildlife Conservancy, to undertake research to support the recovery of Australia’s threatened species.
The work has been published in the science journal Biological Conservation.
Photos are available in dropbox to accompany this story. Photographers must be credited.
Jaana Dielenberg, TSR Hub Science Communication Manager, 0413 585 709 email@example.com
Top image: Cat with a native Pale Headed Rosella. Photo: Brisbane City Council CC
Fifteen tiny quoll pouch-young have been born to three female eastern quolls from a pioneer group of 20 animals released into Booderee National Park. In a big win for the reintroduction project, these are the first eastern quolls known to be born in the wild on the Australian mainland for more than 50 years.
Mouse-sized carnivorous marsupial the Endangered Kangaroo Island dunnart has only rarely been seen in the past 20 years. TSR Hub researcher Rosemary Hohnen is on the job working with local partners to develop better monitoring methods for the elusive species, and to evaluate the impact of feral cats on its persistence. Here she gives us a taste of the action, and despite the tiny size of the mammal there is a lot of heavy lifting…
Monitoring the nests of endangered species of cockatoos has not always been practical using traditional methods. However, new bioacoustic methods are now being applied to the monitoring of two endangered sub-species of cockatoo in southern Australia, the south-eastern red-tailed black-cockatoo and the Kangaroo Island glossy black-cockatoo. Daniella Teixeira, PhD candidate at The University of Queensland, takes up the story.
Threatened Species Recovery Hub researcher profile.
The gnawing question ‘what if we had known earlier...?’ is a recurring theme of frustration and failure in much conservation biology – as it is in human experience generally. When recognition of the imminence of a serious and irretrievable loss is belated, opportunities for better outcomes are fatally lost.