Gutters are a beacon to pests for more than one reason. If the moisture and decaying organic matter in a clogged system isn't the primary draw, then it's often the fact that gutters, high above the ground, offer a relatively safe perch. For that reason, wasps, hornets, and bees are known to nest both inside and beneath gutters. Obviously, no one wants to live in close proximity to a colony of stinging insects, but this isn't solely a quality-of-life issue. The weight of an especially large nest could pull down the gutters, or worse, compromise the roof itself. If you encounter a bees' nest, therefore, act quickly to remove it, whether on your own or in collaboration with a qualified pest-control pro.