Tree squirrels are active, bushy-tailed rodents that nest in trees, attics, and chimneys. The most common species include the Eastern Gray Squirrel and Fox Squirrel. They gnaw on wood, electrical wiring, and insulation, causing fire hazards and costly damage. Squirrels enter homes through roof vents, gaps, and soffits, especially in fall and winter. Professional removal and exclusion techniques help prevent re-entry.