Wind power can help the world fight climate change, but it’s not so great for bats.

A new study of wind turbines in Britain found that each turbine killed one to two bats each month on average, with some killing more than 60. The researchers said that the efforts that are required in many countries to assess the environmental effect of planned wind farms have proved faulty and inadequate in measuring the risk to bats. There are more than 300,000 wind turbines around the world.

The risks to birds of the blades of wind turbines are becoming well understood, but the risk to bats, while known, has been poorly defined until now, said Fiona Mathews, lead author of the study and an assistant professor of mammalian biology at the University of Exeter in England. Bats, she said, might be attracted to turbines, whether because of the noise the machines make or the bugs that are trapped in the air movement: “It’s a ready food supply.”

Her team found bat casualties in unexpected places like high-altitude spots, she said.

Finding the bats, which are small and not colorful, presented special challenges. Using specially trained bat-sniffing dogs, the researchers found the hard-to-spot bat corpses at the bases of turbines at 46 wind farms around England. Dr. Mathews said she contacted an expert who trains dogs to sniff out bodies, bombs and the like for bat duty. “He just killed himself laughing,” she said, and then he told her, “This is the funniest thing anybody’s ever asked me to do.”