Bird and Bat Kills by Wind Turbines

Ohio HB490 would impose a fee on wind towers to compensate for bird and bat kills. I was curious to see how much of a problem this is. Wind turbines kill 140,000 to 328,000 birds each year, amounting to roughly to three to five per MW in the eastern U.S. (a). While this estimate is much smaller than for buildings or communication towers (b), there are many fewer wind turbines than other obstacles. So the deaths per turbine may be greater than for other obstacles.
About twice as many bats as birds are killed by wind turbines (b). I could not find bat data for other obstacles.
(a) S. R. Loss, et al., “Estimates of bird collision mortality at wind facilities in the contiguous United States” Biological Conservation, Vol. 168, December 2013, Pages 201–209
(b) Justin Doom, “U.S. Eases Turbine Bird-Death Rule as Cats Kill Millions”, Dec 6, 2013 3:14 PM ET
(c) Rebecca Boyle, “Wind Turbines Kill More Than 600,000 Bats A Year. What Should We Do?” Popular Science, Posted 11.19.2013 at 4:03 pm