Taking care of the trees in your backyard is a wonderful hobby, but trees require far more than just simple watering and pruning of their lower branches. Sometimes large trees can get sick and pose a hazard to the surrounding environment, even your home. This is when hiring the help of a professional tree removal company is a smart idea. Doing it yourself may even escalate the problem, so don't even think about it. Here's what you need to know about potentially dangerous trees.