Related: http://feedback.arma3.com/view.php?id=24008
If in the category of modules/environment will is available setting -"environment animals" then it will be very good. For example BIS, you can do 3 setting for quantity animals around player: "off", "small", "normal"
Or otherwise, you may make a free zone from animals with a configurable number of animals within a radius and adjusted radius for this purpose (can be a special module).
Or even BIS make the all airports, roads, cities as special zones free from animals, in general. This is only my solutions, any ways of impact to environment-animals will be greatly appreciated.