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.
red_velvet_ant_0046.jpg. Velvet ants are not true ants. True ants are social insects, while velvet ants are a group of solitary wasps. Female velvet ants are wingless throughout their lives; males are winged. There are many species and several genera of velvet ants in Missouri; they look like large, furry ants and are usually brightly colored, often in shades of red and orange, with blackish legs. Males look more like ânormalâ wasps.