Honey bees, Apis mellifera, are a significant pollinator species and are currently in decline. Environmental stressors, like ELFMF, are suspected of being a reason for this. Therefore, the effects of ELFMF on aversivelearning and aggression levels were investigated in this study, as they are critical factors for bees to maintain colony strength. Bees were divided into the following groups: exposure to a magnetic field of 1) 100 µT, 2) 1000 µT oder 3) sham exposure. The sting extension response assay for testing aversivelearning, was completed by a total of 357 bees: n=118 in group 1, n=120 in group 2 and n=119 in group 3 (remark EMF-Portal: the initial numbers of bees which entered the test are not clear). In the intruder assay for testing of the aggression level, bees were collected from 5 different hives in groups of 20 bees from the same hive of origin. Each group of 20 was split into 2 paired subgroups of 10. One subgroup of each pair was exposed to the 100 µT magnetic field (group 1) and the other one was sham exposed (group 3). No exposure to the 1000 µT magnetic field was conducted for this test. In total 60 intruder assay samples were conducted (n = 30 per treatment, with 6 assays/treatment/hive).