Wind does not kill enough birds to stop its use. The wind turbine farm in Altamont Pass, CA has killed approximately 22,000 birds over its 20 year lifetime.
22,000 birds over 7000 turbines is just over 3 birds / turbine, and 0.157… birds/turbine/year.
In comparison the Exxon Valdez disaster killed an estimated 250,000 birds, including 250 bald eagles.
Many more birds are killed annually in collisions with vehicles (60 million).
None of this takes into account the birds that would have been killed by the pollution generated by coal. Coal mining is a huge water polluter - been to West Virginia lately? There are no fish left in many streams for some birds to eat.
Overall, wind is a far cleaner and less damaging (no source is 100% without waste) source of electricity than coal, nuclear or hydro.
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