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“However, we are uncertain about the relative importance of different factors that influence that risk,” the agency said. “We are also uncertain which strategies would best mitigate the effects of wind energy developments on raptors. Populations of raptors with relatively low fecundity, such as golden eagles, are more susceptible to population declines due to new sources of mortality.”

Late last month, the Obama administration made headlines when it fined Duke Energy Corp. $1 million for killing 14 eagles and 149 other birds at wind farms.

That was the first time the federal government had fined wind farms for bird kills.