Squirrels are of many types that are spread across the North American continent, and are found in many other parts of the world as well. They feed on nuts, grasses, flowers, etc. When the infestation grows to large numbers, they can even ruin the look of your lawn. Not only will they ruin the flowerbed, they will gnaw at tree trunks and make holes for nesting.
As winter arrives, squirrel removal becomes necessary because the pests try and move to a warmer nesting place. They are small creatures and seek protection from the elements. To get into your attic, they will try and eat away the corner to make holes for access.
Once inside, they can eat away the insulation and boards to build their nests, opening airways in doing so and entrances for dirt to come in and settle in your attic with them. They chew away at the wires, which can cause issues with your electricity.
If that wasn’t all, squirrels carry rabies. If you see a confused looking or a manic squirrel, it usually means it’s rabid. Stay away.