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Re:Why Wind Turbines Have Three Blades by mikeash on Friday May 06, 2016 @10:59AM (#11644414)
They won't kill the same kind of birds, though. For example, there's a new rule raising the number of bald eagles which can be killed by wind turbines to 4,200 per year. I'm guessing that house cats kill few bald eagles.

It may still be a nonissue, of course, but the comparison with cats doesn't tell the whole story.

Re:Why Wind Turbines Have Three Blades by Houshalter on Friday May 06, 2016 @12:03PM (#11644848)
Fair point, I was just responding to the idea that wind turbines would kill all the birds, which isn't realistic. As a percentage of the bird population, it's negligible.

I don't see any reason why bald eagles would be more likely to be killed by turbines than other species of birds. If only 0.01% of birds are killed by turbines, then they would only kill 1 bald eagle a year out of thousands.

Regardless, this is more of a reason to invent solutions for repelling birds from turbines. Maybe we could come up with noises or lights that repel them. Or drones, or a water cannon robot. But I'm not certain it's even an issue.

Re:Why Wind Turbines Have Three Blades by mikeash on Friday May 06, 2016 @12:34PM (#11645046)
The current rule is something like 1,200/year. There are about 143,000 bald eagles in the US. The 4,200 number is set at a level which they think the species can sustain. I don't know why bald eagles would be more likely to be killed by turbines, but apparently they are:

http://www.fws.gov/midwest/wind/wildlifeimpacts/index.html

"Not all bird species are equally vulnerable to wind turbines. Eagles appear to be particularly susceptible."

Re:Why Wind Turbines Have Three Blades by Aelinsaar on Friday May 06, 2016 @02:34PM (#11645772)
Not all birds fly the same way, in the same regions, at the same altitudes. Balds eagles tend to soar and hunt in places we like to put wind turbines. Small birds tend to move smaller distances, often in about 100m around a water source.
Re:Why Wind Turbines Have Three Blades by scblock on Friday May 06, 2016 @04:35PM (#11646549)
Thanks.
Re:Why Wind Turbines Have Three Blades by cr1895 on Friday May 06, 2016 @11:36AM (#11644659)
Wind turbines kill <this type of bird> is highly location specific; so again, saying wind turbines kill lots of bald eagles is also not telling the whole story.
Re:Why Wind Turbines Have Three Blades by zeckalpha on Friday May 06, 2016 @11:46AM (#11644722)
And eagles may kill smaller birds, so the net might be positive? More sub-optimization.
Re:Why Wind Turbines Have Three Blades by Aelinsaar on Friday May 06, 2016 @03:02PM (#11645988)
...Eagles aren't generally bird hunters. Bald eagles for instance, eat mostly fish.

It's a nice thought though, just kill off the big birds, and watch the benefits "trickle down" to the little birds. /s

Re:Why Wind Turbines Have Three Blades by scblock on Friday May 06, 2016 @11:24AM (#11644579)
You're going to have to provide documentation of this.
Re:Why Wind Turbines Have Three Blades by mikeash on Friday May 06, 2016 @12:35PM (#11645053)
Of what? The new rule allowing for 4,200 to be killed each year is a simple Google away. The conjecture that house cats don't kill many eagles is just common sense, and if that's what you're referring to then I assume you're just making a joke.