There are many pests that live for longer or shorter periods (as long as they are allowed!) on or under a roof. Whether we are talking about rodents, wasps, birds, or other animals like squirrels (these are the kind of animals that can make their nest anywhere, especially if the place provides the heat and comfort they seek), the damage and the troubles they can cause is significant.
Though birds and small animals may seem cute and you find yourself having some doubts about destroying their nests and chasing them away, remember that they do not only produce a lot of mess, but they also transmit diseases and create a variety of other problems that could jeopardize the structure of the roof. Some pests crunch roofing materials, others make their nests in the attic, in the lower part of the eaves, sometimes blocking the ventilation holes or even the chimney. They find other roofing materials besides metal roofing, so it is always a good choice.
For all these issues, you need to be prepared with appropriate solutions and equipment, but especially to be willing to act promptly. If you do not have the necessary resources, there are many companies specialized in pest removal that you can contact at any time, in order to help you block the access areas of pests and solve the problems caused by them.
The best thing to do is to include checking for pests in your regular roof maintenance.