Adult bees can range in size from about 2 mm to 4 cm, (about 0.08-1.6 inches.) Bees depend entirely on feeding on flowers, which consist of pollen and nectar. As bees transfer from flower to flower they gather pollen which are deposited to the flowers they visit. Unfortunately, as bees spend most of their time where flowers grow they construct their nest on or near your property. They can potentially become a problem when you try to harm them. They will attack as a swarm.