Secretary of the Interior Ryan Zinke recently falsely claimed that wind turbines kill 750,000 birds each year. In actuality, wind turbines kill a little more than 350,000 birds annually — which is far fewer than cars, house cats, or plate-glass windows put to death. What’s the biggest threat to our flying friends? According to the Audubon Society, it’s climate change. The Acoustic Lighthouse generates a high-pitched sound that prompts birds to slow down.