Environmental impact of wind power
Birds

Source
Estimated mortality (in millions)
Estimated deaths (per GWh)
Wind turbines
0.02 – 0.57
0.269
Aircraft
0.08
(n/a)
Nuclear power plants
0 - 0.33
0 - 0.416
Oilfield oil waste & waste water pits
0.50 – 1
(n/a)
Nuisance bird control kills (airports, agriculture, etc...)
2
(n/a)
Communication towers (cellular, radio, microwave)
4 – 50
(n/a)
Large communications towers (over 180', N. America)
6.8
(n/a)
Fossil fuel powerplants
14
5.18
Cars & trucks
50 – 100
(n/a)
Agriculture
67
(n/a)
Pesticide use
72
(n/a)
Hunting
100 – 120
(n/a)
Transmission lines (conventional powerplants)
174 – 175
(n/a)
Buildings and windows
365 – 988
(n/a)
Domestic and feral cats
210 – 3,700
(n/a)

Question: How many birds are killed by cars and buildings?
Answer: 57 million birds are killed by cars and 365 to 988 million are killed by collisions with buildings annually.