The BVD stands for Back Vertex Distance, this is a measurement that is included on any prescription where the sphere or cylinder powers are higher than + or - 5.00D and to a lesser extent some prescriptions where it is less than this power.
Winged Drone | Alate | Male Ant. Drones are the only male ants in a colony. They are born from un-fertilized eggs. Drones are not like typical ants. They donât do any work in their nests, and they look more like wasps than ants. They are reproductive winged ants and so are alates.
Although it sounds like carpenter ants, you probably have acrobat ants. They are called acrobat ants because of the weird way they raise up their abdomen (the third body segment) when disturbed or threatened. Acrobat ants are also pretty easy to identify because that third body segment is heart-shaped.