“…In the control group, where the average T I remained below ideal range, the bees possibly activated the muscular heat production. Thermogenesis by muscle vibration is important not only to preflight warm-up (Heinrich, 1979;Heinrich & Esch, 1994;Seeley et al, 2003) but also to improve the bee metabolism (Roubik, 2012), control of the internal hive temperature and brood incubation (Kronenberg & Heller, 1982;Heinrich, 1993;Heinrich, 1996;Kleinhenz et al, 2003). The heat production rates are caste-dependent; workers bees contribute more than drones and queens for hive thermoregulation (Fahrenholz et al, 1989).…”