There are several non lethal means of getting rid of them.
Carpenter bee in attic.
Carpenter bees in the attic.
Here females lay their eggs while males burrow until spring.
Carpenter bees xylocopa violacea pose a real threat to any wooden structure or surface including your attic while they typically don t sting humans these monstrous bees are known for boring long complex tunnels in wood.
Though not the best of situations be thankful this is happening into the attic and not the main living spaces.
Carpenter bee traps are convenient to use and offer a non toxic method of elimination.
Honey bees in the attic are often an overflow from a hive in a wall or at the eave where it is cool enough to sustain wax and protect honey stores.
Finding carpenter bees in bathroom in most cases one of the situations described above is what causes some to end up inside the home for sure.
You may also be dealing with carpenter bees which can do significant damage to wood.