Table 1.

Mean chronological ages and s.e.m. of bees tested in experiments 1 and 2

	Mean chronological age (days)
Group	Experiment 1	Experiment 2
Foragers foraging for 6–13 days	24.40±0.71	33.77±0.87
Foragers foraging for >15 days	32.43±0.52	28.63±0.62
Nurse bees corresponding to 6–13 days	22.70±0.73	33.53±0.83
Nurse bees corresponding to >15 days	32.73±0.52	30.80±0.78