Biting black flies are swarming Minnesota's North Shore

DULUTH – In the seconds that Peggy Flynn walked toward Lake Superior for a swim, her leg was covered with a black mass of swarming flies.

Those near the North Shore have reported bothersome batches of stable flies, biting insects that feast on human and animal blood.

"You couldn't even enjoy the lake," said Flynn, who was camping in Gooseberry Falls State Park with her husband Sunday, Monday and Tuesday. "We've seen some flies in the past, but this was more than we've ever seen before."

https://www.startribune.com/biting-black-flies-swarm-the-north-shore/571950412/