Electrocution Isn’t the Main Thing Killing Birds Along Power Lines
Most of the dead birds collected had bullet fragments and shotgun pellets in them.

Birds are electrocuted by power lines. Shooting at birds perched atop power poles is a serious problem. Two-thirds (of the birds) found dead under power lines in five locations across western United States had been shot.
Eve Thomason is a wildlife scientist at Boise State University, Idaho. She said that if the bodies of birds found along power lines show signs of burns or charring, it's likely they died by electrocution. The animal could have been injured before it was zapped.
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