Fig. 1: Phylogeny and distribution of Apis honeybees.

A Schematic diagram of the honeybee phylogeny. The six species studied in the present work are shown with photos. Four of them have been examined previously9, characterized by varied capacities in heat production (numbers represent heat production per mass, W/kg). B Native distributions of honeybee species. The same honeybee species is marked in Panels (A, B) using the same color code. YN Yunnan Province, China; JL Jilin Province, China.