Fig. 1. Experimental layout to investigate how bees tune their dancing according to their colony's nectar influx. An observation hive was connected to a narrow corridor and to a flight enclosure. The flight enclosure was used to control the totality of the nectar sources exploited by the colony. Two different feeders were used, each delivering unscented 1.8 mol l^-1 sucrose solution. The first one, individual feeder (IF), was placed at the end of the corridor and offered sucrose solution with a constant flow rate of 5 µl min^-1. During each recording session, marked bees were allowed to forage individually on the IF and their behaviours were video-recorded along eight successive foraging cycles. Simultaneously, the second feeder, group feeder (GF), was placed inside the flight enclosure and offered a constant solution flow rate of either 3 or 90 µl min^-1 (according to three different experimental series: the constant, the decreasing and the increasing series, see Materials and methods for details). During each session, a group of foragers collected sucrose solution at the GF while a single marked bee foraged on the IF. Quantifiable variations in the colony's sugar solution intake rate were induced by modifying the solution flow rate offered at the GF.