  A new system, Bee Cluster 3D, allowing the study of the time evolution of the
3D temperature distribution in a bee hive is presented. This system can be used
to evaluate the cluster size and the location of the queen during winter. In
summer, the device can be used to quantify the size of the brood nest and the
breeding activity of the queen. The system does not disturb the activity of the
colony and can be used on any hive. This electronic system was developed to be
non-intrusive, miniaturized, and energy autonomous.
