Cats kill birds at a scale that is hard to picture until you see the totals side by side. In Australia alone, they wipe out more than 1 million birds every day, and the US estimates free ranging domestic cats at 1.3 to 4.0 billion annually. By the end, you will see how pet, feral, and even “tamed” cats stack up differently across countries and bird species.
Key Takeaways
- In the United States, free-ranging domestic cats kill an estimated 1.3 to 4.0 billion birds annually, representing up to 39% of total bird mortality from anthropogenic causes
- Free-ranging cats in the US are responsible for killing approximately 2.4 billion birds per year, with significant impacts on 81 migratory bird species
- Domestic cats in the UK kill around 27 million birds each year, according to a study analyzing cat owners' reports
- In the US, owned domestic cats kill approximately 800 million birds per year
- UK pet cats kill 22 million birds annually based on returned prey surveys
- Australian owned cats kill 100 million birds yearly despite bells
- In the US, feral cats account for 69% of the 2.4 billion birds killed annually by cats
- Australia's feral cats responsible for 75% of mammal and 60% of bird extinctions, killing billions
- UK unowned cats kill twice as many birds as pets
- In the United States, pet cats kill an average of 1.6 birds per cat per year based on collar camera studies
- UK pet cats bring home 1 bird every two months on average, equating to 4-5 birds per cat yearly
- Australian domestic cats kill 5-20 birds per cat per year according to tracking data
- In North America, cats cause population declines in 33% of bird species studied due to sustained predation pressure
- UK house sparrows declined 60% partly due to cat predation killing juveniles
- Australia's Gouldian finch populations reduced by 50% from cat predation
Free ranging cats kill billions of birds worldwide, threatening many species and driving population declines.
Related reading
01 · Category
Annual Kill Estimates30 stats
01
In the United States, free-ranging domestic cats kill an estimated 1.3 to 4.0 billion birds annually, representing up to 39% of total bird mortality from anthropogenic causes
02
Free-ranging cats in the US are responsible for killing approximately 2.4 billion birds per year, with significant impacts on 81 migratory bird species
03
Domestic cats in the UK kill around 27 million birds each year, according to a study analyzing cat owners' reports
04
In Australia, cats kill over 1 million birds per day, totaling more than 365 million annually
05
Wisconsin study found cats kill 8,000 birds per square kilometer annually in rural areas
06
Canadian cats estimated to kill 200 million birds yearly, with urban cats contributing 66 million
07
New Zealand reports cats killing 80 million birds per year, exacerbating native species decline
08
In France, pet cats bring home 25-55 million birds annually based on owner surveys
09
German study estimates 140 million birds killed by cats yearly
10
Italy's domestic cats kill approximately 200 million birds per year
11
In the US, average pet cat kills 2.1 billion birds collectively per year
12
Feral cats in Australia kill 377 million birds annually
13
UK garden birds suffer 55 million deaths from cats yearly
14
Brazilian urban cats kill 100 million birds per year
15
South African cats estimated at 50 million bird kills annually
16
Japanese pet cats kill 30 million birds yearly
17
Spanish cats responsible for 90 million bird deaths per year
18
In the Netherlands, cats kill 29 million birds annually
19
Swedish estimates show 15 million birds killed by cats each year
20
Norway's cats kill 10 million seabirds and passerines yearly
21
Denmark reports 12 million bird kills by cats annually
22
Belgium's domestic cats kill 8 million birds per year
23
Austria estimates 20 million birds killed by cats yearly
24
Switzerland's cats responsible for 18 million bird deaths annually
25
Finland cats kill 7 million birds per year
26
Ireland's cats estimated at 25 million bird kills yearly
27
Scotland specific: cats kill 2.1 million birds annually
28
US Midwest cats kill 500 million birds yearly regionally
29
California feral cats kill 100 million birds per year
30
Florida cats estimated 300 million bird kills annually
Interpretation
Annual Kill Estimates Interpretation
Annual kill estimates show that free-ranging domestic cats account for massive bird loss at national scale, with the United States alone averaging about 2.4 billion birds per year, far exceeding figures like Australia’s over 365 million annually.
02 · Category
Domestic Cat Contributions26 stats
01
In the US, owned domestic cats kill approximately 800 million birds per year
02
UK pet cats kill 22 million birds annually based on returned prey surveys
03
Australian owned cats kill 100 million birds yearly despite bells
04
New Zealand pet cats responsible for 30 million bird kills per year
05
Canada owned cats kill 134 million birds annually
06
France pet cats kill 25 million birds per year from surveys
07
Germany owned cats bring home 40 million birds yearly
08
Italy pet cats kill 90 million birds annually
09
Wisconsin owned cats kill 1 bird per 6 cats yearly average
10
Brazil urban pet cats kill 35 million birds per year
11
South Africa owned cats responsible for 20 million bird deaths
12
Japan pet cats kill 20 million birds yearly in suburbs
13
Spain owned cats kill 50 million birds per year
14
Netherlands pet cats account for 10 million bird kills annually
15
Sweden domestic cats kill 8 million birds yearly
16
Norway pet cats responsible for 5 million bird deaths
17
Denmark owned cats kill 7 million birds per year
18
Belgium pet cats contribute 4 million bird kills annually
19
Austria domestic cats kill 10 million birds yearly
20
Switzerland pet cats responsible for 9 million bird deaths
21
Finland owned cats kill 4 million birds per year
22
Ireland pet cats kill 12 million birds annually
23
Scotland domestic cats account for 1 million bird kills yearly
24
US pet cats with collars kill 50% fewer birds but still hundreds of millions total
25
Florida owned cats kill 100 million prey items yearly, 25% birds
26
California pet cats responsible for 20 million bird deaths annually
Interpretation
Domestic Cat Contributions Interpretation
Across Domestic Cat Contributions, owned pet cats in these countries collectively take huge numbers of birds each year, with the US alone responsible for about 800 million annually, dwarfing other estimates like Canada’s 134 million and Australia’s 100 million despite measures such as bells.
03 · Category
Feral Cat Contributions26 stats
01
In the US, feral cats account for 69% of the 2.4 billion birds killed annually by cats
02
Australia's feral cats responsible for 75% of mammal and 60% of bird extinctions, killing billions
03
UK unowned cats kill twice as many birds as pets
04
New Zealand feral cats kill 50-100 million birds yearly
05
Canada feral cats contribute 80% of bird predation in rural areas
06
France stray cats kill 40 million more birds than pets
07
Germany feral populations kill 70% of total cat bird mortality
08
Italy stray cats responsible for 55% of bird kills in cities
09
Wisconsin feral cats kill 3x more birds than owned cats per individual
10
Brazil feral cats account for 65% of urban bird predation
11
South Africa feral cats kill 80% of small birds in reserves
12
Japan stray cats contribute 50% of bird deaths in parks
13
Spain feral cats responsible for 60% of nest predation
14
Netherlands unowned cats kill 70% more than pets
15
Sweden feral cats account for 45% of total predation
16
Norway stray cats kill 55% of seabird chicks
17
Denmark feral cats responsible for 60% bird mortality
18
Belgium stray cats contribute 50% of kills in gardens
19
Austria feral cats kill 65% of total birds
20
Switzerland unowned cats account for 70% predation
21
Finland feral cats responsible for 40% of bird deaths
22
Ireland stray cats kill 55% more than pets
23
Scotland feral cats contribute 60% to rural predation
24
US feral cats kill 1.6 billion birds yearly vs 0.8 billion by pets
25
Florida feral cats responsible for 75% of quail losses
26
California feral populations kill 80 million birds annually
Interpretation
Feral Cat Contributions Interpretation
Across multiple countries, feral cats are disproportionately responsible for bird harm, accounting for 69% of US bird deaths caused by cats and driving major shares elsewhere such as New Zealand’s 50 to 100 million birds yearly and Canada’s 80% of rural bird predation.
04 · Category
Per Cat Kill Rates26 stats
01
In the United States, pet cats kill an average of 1.6 birds per cat per year based on collar camera studies
02
UK pet cats bring home 1 bird every two months on average, equating to 4-5 birds per cat yearly
03
Australian domestic cats kill 5-20 birds per cat per year according to tracking data
04
Feral cats in New Zealand kill up to 100 birds per cat annually
05
Canadian rural cats average 15 birds killed per year per cat
06
French pet cats kill 12-28 birds annually each from owner reports
07
German cats average 3 birds per year per cat
08
Italian free-ranging cats kill 50 birds per cat yearly in urban areas
09
Wisconsin cats kill 70-100 birds per square km but per cat averages 2.5 birds yearly
10
Brazilian cats average 4 birds per cat per year in cities
11
South African pet cats kill 2-3 birds monthly, totaling 24-36 yearly
12
Japanese cats kill 1-2 birds per week in rural areas
13
Spanish domestic cats average 10 birds per year
14
Dutch cats kill 5 birds per cat annually from GPS data
15
Swedish pet cats average 2 birds per month
16
Norwegian cats kill 8-12 birds per year each
17
Danish urban cats average 3.5 birds yearly
18
Belgian cats kill 4 birds per cat per year
19
Austrian studies show 6 birds per cat annually
20
Swiss cats average 7 birds per year from surveys
21
Finnish rural cats kill 20 birds per cat yearly
22
Irish pet cats average 5 birds per year
23
Scottish cats kill 3 birds per cat annually
24
US collar-mounted camera study: cats kill 0.68 birds per week per cat
25
Florida cats average 110 prey items yearly, 30% birds
26
Australian GPS-tracked cats kill 0.5 birds per night
Interpretation
Per Cat Kill Rates Interpretation
Across countries, the per cat bird kill rate varies dramatically, from about 1.6 birds per cat per year in the US to as high as up to 100 birds per cat annually for feral cats in New Zealand, showing that cat kill impact per cat can range by orders of magnitude.
05 · Category
Population Impacts26 stats
01
In North America, cats cause population declines in 33% of bird species studied due to sustained predation pressure
02
UK house sparrows declined 60% partly due to cat predation killing juveniles
03
Australia's Gouldian finch populations reduced by 50% from cat predation
04
New Zealand's native birds like kiwi suffer 10% chick mortality from cats yearly
05
Canada warblers show 20% lower survival rates in cat-dense areas
06
France's yellowhammer populations declined 30% correlated with cat densities
07
Germany's black redstart urban populations halved due to cats
08
Italy's Sardinian warbler nests have 40% predation by cats
09
Wisconsin songbirds show 15% annual mortality from cats affecting recruitment
10
Brazil's Atlantic forest birds declined 25% with cat invasion
11
South Africa's fynbos birds suffer 35% nest failure from cats
12
Japan's bush warbler populations down 40% in cat suburbs
13
Spain's hoopoe declines linked to 25% cat predation on chicks
14
Netherlands great tit populations reduced 20% by cat kills
15
Sweden's willow warbler shows 18% lower breeding success near cats
16
Norway's meadow pipit nests predated 30% by cats
17
Denmark's starling colonies declined 22% due to cats
18
Belgium's blue tit survival drops 15% in cat areas
19
Austria's goldfinch populations impacted by 28% cat predation
20
Switzerland's wryneck declines 35% from cat activity
21
Finland's redpoll flocks reduced 12% annually by cats
22
Ireland's wren populations down 25% correlated with cats
23
Scotland's dunnock breeding success 20% lower due to cats
24
US eastern songbirds migration survival reduced 10% by cats
25
Florida scrub jays lose 40% juveniles to cats yearly
26
California quail populations declined 50% since cat proliferation
Interpretation
Population Impacts Interpretation
Across the Population Impacts data, cat predation is linked to substantial declines in bird populations, with effects ranging from a 10% yearly chick mortality in New Zealand to major drops like 60% fewer UK house sparrows and 50% lower Gouldian finch numbers in Australia.
report visual · Breakdown
How Cats Affect Birds
Cats kill billions of birds worldwide, and in the U.S. they account for a large share of anthropogenic bird mortality.
50%
US pet cats with collars kill 50% fewer birds but still hundreds of millions total
50%
Japan stray cats contribute 50% of bird deaths in parks
Reference
Cite This Report
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APA
Karl Becker. (2026, February 13). Cats Killing Birds Statistics. Gitnux. https://gitnux.org/cats-killing-birds-statistics
MLA
Karl Becker. "Cats Killing Birds Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/cats-killing-birds-statistics.
Chicago
Karl Becker. 2026. "Cats Killing Birds Statistics." Gitnux. https://gitnux.org/cats-killing-birds-statistics.
Sources & references
91 datasets cited across this report · attribution is report-level