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So we conducted a literature review of about 20 peer reviewed academic papers studying the effects of wind turbines.
A selection of these papers is listed in the bibliography below. These papers not only carefully studied the effects of wind farms on birds and bats across the world, they studied those effects for years, sometimes even a decade or longer.
The results were clear: it turns out wind farms kill ten times fewer birds than fossil fuel power plants. Specifically, wind farms and nuclear power plants kill only 0.3 to 0.4 birds per GWh of electricity generated, while oil, gas, and coal power plants kill 5.4 birds per GWh of electricity generated. 
If we simply count up the birds based on the amount of electricity generated by each source, it means Wind Farms kill about 7,000 birds per year, Nuclear power plants kill about 327,000 birds per year, and coal and natural gas plants combined kill about 14,500,000 birds per year. 
These number are part of the reason why the National Audubon society “strongly supports” wind power.
Alright, on to the data! Each of the studies (, , , , , ) analyzed different sets of wind farms in different places. Some analyzed small wind farms, others large farms, others on shore vs. off shore. The following table is a compilation of the results from these studies:
Larger turbine blades turn much more slowly so birds can easily avoid them. Thankfully, larger turbines are also more efficient and cost effective, so it is very rare to see small turbines used in wind farms at all any more.
Regardless, fossil fuel based power plants kill ten times as many birds as do wind farms.
1. Newton & Little. Assessment of wind-farm and other bird casualties from carcasses found on a Northumbrian beach over an 11-year period. Bird Study, Vol. 56, July 2009.
2. Sovacool, Benjamin. Contextualizing avian mortality: A preliminary appraisal of bird and bat fatalities from wind, fossil-fuel, and nuclear electricity. Energy Policy, Vol. 37, June 2009.
3. de Lucas, Janss, Whitfield, & Ferrer. Collision fatality of raptors in wind farms does not depend on raptor abundance. Journal of Applied Ecology, Vol. 45, December 2008.
4. Smallwood & Thelander. Bird mortality in the Altamont Pass Wind Resource Area, California. Journal of Wildlife Management, Vol. 72, January 2008.
5. Kerlinger, Gehring, Erickson, Curry, Jain, & Guarnaccia. Night migrant fatalities and obstruction lighting at turbines in North America. Wilson Journal of Ornithology, Vol. 122, December 2010.
6. Everaert & Stienen. Impact of wind turbines on birds in Zeebrugge (Belgium). Biodiversity and Conservation, Vol. 16, November 2007.
7. Osborn, Higgins, Usgaard, Dieter, & Neiger. Bird mortality associated with wind turbines at the Buffalo Ridge wind resource area, Minnesota. American Midland Naturalist, Vol. 143, January 2000.