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We don't know how many birds die in structural collisions
This makes it a weak argument against windmills
al. point out that speculating from found carcasses likely undercounts the actual fatality figure because evidence is increasingly indicating that birds tend to survive for some time, and thus continue traveling, after a collision. Cameras and radar that detect incoming flocks can be connected to automated systems to stop turning windmill blades at times of high aviation traffic, such as during migrations. Habitat loss, climate change, excessive construction of tall buildings, outdoor cats, and airplanes and motor vehicles are key factors contributing to this destruction.
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