In my experience flyers don't chew on homes anywhere near what reds or grays do. That doesn't mean that they won't chew as I've had it happen, just that they are not as likely to do so. If you're doing a flyer exclusion, there is a difference compared to a bat exclusion.
Bats do not have the tooth structure to create their own openings nor do the they the body physiology to push a lot of materials wedged tightly in place out of their way. Because of the flat skull bats have, they are able to fit through thin gaps in building materials other animals cannot fit through (3/8" x 1 1/4" for most adult bat species which an be easily shown to a client by taking a standard Bic pen and covering everything from the ball point to the Bic or USA crest on it). This means a bat exclusion can be done with building materials and techniques that block existing openings instead of using materials and techniques that prevent openings from being created.
Rodents, on the other hand, have a rounder skull along with the required equipment and physiology to create their own openings and move materials out of their way. This allows them to create their own access to a structure instead of having to have use existing access points. Basically, if a rodent can get their head through an opening their body will follow. So when doing a rodent exclusion you need to make sure to use products and techniques rodents cannot move, tear apart or want to move or tear apart.
The best solution is to combine both services into one service which is what a lot of individuals and companies are already doing. That way your rodent exclusion is just like a bat exclusion and a bat exclusion is just like a rodent exclusion. It is also a great selling point for why your service is better, even if it is more expense, than your competition.
