Red and Gray Squirrels are incredible climbers and problem solvers, and can easily chew holes into the attic from the exterior of almost any structure for shelter. Squirrels can also enter through chimneys. Gray Squirrels tend to come in up high on the house. Red Squirrels will enter up high on the roof, or down low under a deck, making it more difficult to find the entry point. Flying Squirrels are nocturnal, and always get in high up on the house, usually at the dormers or ridge vents. Advantage Pest Control uses one way doors to exclude the animals from the home, then seals any potential entry points permanently.