One thing to add. Wear good solid boots or good shoes with heavy socks. If one of those deer flies gets you on the ankle, you may end up having trouble walking and be unable to even get a shoe on. Do not wear flip flops, sandals or any open shoe in deer fly country.

For some people deer fly bites cause a worse reaction than bumble bee stings with pain, fever and extended swelling that can last for several days.

Deer flies can often be noticed by their rather loud buzzing, but they will also sneak up on the ground or along boat floors from behind their prey target.