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They kill one bird for every ten thousand killed by housecats.

When they're situated in mountain passes, they kill a lot of birds.

When they're situated in windswept plains, they do not.

FYI they kill a lot of bats too. Many of them are turned off at certain times so as to kill fewer (source - wife is a bat-ologist)

That is true, they do, but in the UK at least all new ones/sites do need full ecological impact assessments (there are various levels of assessment needed depending on habitat suitability) and hopefully there will be a lessening on the problem long-term - off-shore is the way to go, of course!

(I do/help with these assessments)