Fig. 1. Colour thermograms of guard bees and their examinees at the hive entrance. (A₁, A₂) Increase in thorax temperature during a heating phase of an examinee (E) as a reaction to a long-lasting examination (duration >30 s) by guards (G). In contrast to the examinee, the guards did not heat up; time difference between thermograms A₁ and A₂ is 1 min 24 s. (B) Cooling of the proboscis of an examinee by regurgitated fluid during tongue stropping in the course of a thoracic heating phase. Ambient air temperature: 18.5°C.

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