Maybe this article can shed some light:
https://www.nbcnews.com/mach/science/wind-energy-takes-toll-birds-now-there-s-help-ncna866336
Here’s a scientific study:
https://www.sciencedirect.com/science/article/abs/pii/S0006320713003522
Regarding your ScienceDirect link on bird mortality, I posted a separate thread that includes a link to Rio’s bat mortality post:
http://www.freerepublic.com/focus/f-chat/3780743/posts