I have only seen wind farms in Hawaii where they omnipresent. Didn't hear any concerns about bird kill from the locals there. Did a quick Google search on this and found this in a USA Today article.
USA Today article :
"Wind turbines kill between 214,000 and 368,000 birds annually a small fraction compared with the estimated 6.8 million fatalities from collisions with cell and radio towers and the 1.4 billion to 3.7 billion deaths from cats, according to the peer-reviewed study by two federal scientists..."
A quarter million birds is nothing to joke about, but pretty small compared to cats. That number shocked me. I also was unaware of the impact of the various towers on the bird population.
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