Squirrels just like all mammals reproduce with young babies. Squirrels want to find a nice warm, dry, safe spot to raise their young. Your attic makes for a great spot. Although a great place to raise squirrels, they cause a lot of issues within your home. Squirrels will cause damage to wires, duct work, insulation, roof, and framing. Squirrels will also use your attic as a bathroom. This will cause a foul odor along with all the health risks from urine and feces inside your home.