Varroa mites are external honeybee parasites that attack both the adults and the brood, with a distinct preference for drone brood. They suck the blood, weakening and shortening the life span of the ones on which they feed. Untreated infestations of varroa mites that are allowed to increase will kill bee colonies. Chemical treatment is available that kills the mites. Inadequate use of chemicals contaminates the honey combs. There are others types of mites and diseases that attack the hive, but none is as mortal as varroa mites. Varroa mites don’t find space to grow in Brazilian native bee colonies because their aggressive instinct of preservation makes them fight and kill any intruder in the hive.