Fig. 4. Thorax temperatures (T_th) of three different honeybees in the sealed brood area on the comb surface. (A) A 2 min warm-up (+4.7°C) prior to a cell visit provides a T_th(entry) of 39.4°C. (B) Heat production during a cell visit is revealed by a net warming, with (T_th)_net=+4.1°C. Heating was not resumed during a subsequent short-duration visit (0.7 min) to the same cell. (C) Repeated warmings prior to consecutive cell visits. Asterisks mark periods of 30 s or longer during which the bee's thorax was hidden by another bee and no temperature measurements could be made.

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