The answer to 'why is my bee nests' is that you likely have a bee hive or nest on your property. Bees build nests to house their colony and protect their queen, eggs, and larvae. Common causes include a swarm of bees looking for a new home or an existing colony expanding. Symptoms include seeing bees flying in and out of a specific area, hearing buzzing noises, or spotting a nest or hive structure.
If the nest is located in a low-traffic area and not causing any issues, it's often best to leave it alone and let the bees live undisturbed. However, if the nest is in a high-traffic area or poses a risk to people or pets, it's generally recommended to call a professional pest control technician to safely remove it.