Honeybees can deposit numerous iron granules in the trophocytes of ventral abdomen.These iron granules contain superparamagnetic magnetites, which seem to be magnetoreceptors.

• 已知蜜蜂能够在腹节的营养细胞内沉积许多铁颗粒，这些铁颗粒内含有许多超顺磁磁铁奈米颗粒，有可能当作磁场之感应器。