Fig. 5. Thermogram of worker bees in the brood area, as seen in a common observation hive. The sealed area appears grey with no further details in this image; open cells are identifiable by the hexagonal structure of the cell rims. One bee with heated thorax [A; T_th(entry)=37.9°C] is about to enter an open cell adjacent to three sealed brood cells and pokes its head and the anterior part of its thorax into the cell (the dark structure on the heated thorax is the scutellum, seen from posterior-dorsal). Worker bee B has just left the open cell in the centre of the image [T_th(exit)=37.3°C]. The view on cell visitors C and D is partly hidden by bees on the comb surface. The onset of heat production during cell visits is roughly indicated when the cell interior and thorax (visible as a ring-like structure around the dark silhouette of the cool abdomen) start `glowing' with increasing intensity. Note the different intensities caused by cell visitors E and F.

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