Researchers at Environment Canada, a department of the federal government, provided a study of human-caused bird deaths in Canada. Causation is both direct and indirect, so cats are counted because they are a non-native species introduced by European settlers. The study can be found at http://www.ace-eco.org/vol8/iss2/art11/
| Cause |
Mortality |
|
|
1 |
Cats, feral |
116,000,000 |
|
2 |
Cats, domestic |
80,000,000 |
|
3 |
Power line collisions |
25,600,000 |
|
4 |
Buildings, houses |
22,400,000 |
|
5 |
Road vehicle collisions |
13,810,906 |
|
6 |
Agricultural pesticides |
2,695,415 |
|
7 |
Buildings, low- and mid-rise |
2,400,000 |
|
8 |
Non-migratory bird harvest |
2,389,124 |
|
9 |
Migratory bird harvest |
2,279,655 |
|
10 |
Agriculture haying (nestlings) |
2,209,400 |
|
11 |
Commercial forestry (nests) |
1,351,340 |
|
12 |
Power line electrocutions |
481,399 |
|
13 |
Power line maintenance (nests) |
388,274 |
|
14 |
Chronic ship-source oil |
321,900 |
|
15 |
Communication tower collisions |
220,649 |
|
16 |
Hydro reservoirs (nests) |
151,162 |
|
17 |
Buildings, tall |
64,000 |
|
18 |
Fishing gill nets |
20,612 |
|
19 |
Wind energy |
16,700 |
| TOTAL |
272,800,536 |
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