Bees

While over 20,000 species of bees exist in the world, California's every last nook & cranny is home to over 1,000 species.  In these species behaviors observed are eusocial and semisocial. 
With the advancements in science we have today we've learned staggering amounts pertaining to the different levels of communication between them and yet it's next to impossible to gauge the different levels of aggression between the species.
 Granted, bees have a purposeful existence. At the same time, a problem not taken care of does not go away. Bees can cause harm to your home and pose an incalculable threat to your family, friends, and pets. Extensive damage can be from the build-up of honey and wax as well as extensive procedures for removing hives in-between walls.
 Never begin removing hives or nests without the proper equipment or a professionals consultation to prevent injury or damage.
One things for sure, bees go hand in hand of being a welcomed guest to an unacceptable pest!