Paramagnetism of Honeybees

The magnetic properties of honeybees have been investigated by measuring their susceptibility, magnetization and electron-spin-resonance (ESR) absorption. The abdomen of adult worker honeybees shows typical paramagnetism with small magnetic remanence down to 4.2 K, while the other parts of the honeybees are apparently diamagnetic. The paramagnetism of the abdomen seems to develop not in the pupal stage but after coming out of comb. Drones show no paramagnetism, but a queen bee seems to have some paramagnetic species in her abdomen.