You may imagine that if it's bad for us, it must be worse for resident wildlife that can't just jump in a vehicle to escape the swarms.
It should come as no surprise that they about loose their minds trying to keep these swarms at bay.
Now, imagine how it must impede their ability to sense danger.
Below is a video clip of a fawn at night....when the flies aren't as bad. He or She is able to be on the alert for danger...ears swivelling....head up....always devoting attention to the search for potential threats.
It's a rough world out there......