Results of multiple regression model.

Best minimal models for number of ants performing sun-basking behaviour, number of visits to the hot spot and duration of one visit are depicted. “Ex.day.o” for day order in the experiment (1–10), “t.air” for air temperature of in the thermostatic box, “t.hot spot” for average temperature of the hot spot, “max.cluster” for the maximal temperature of the ant cluster, “n.ants” for the number of ants present on the experimental day.