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The probabilities of switching to (a) external tasks and (b) transporting brood decrease with increasing corpulence. (c) The probability of switching to transporting brood increases with previous intra-nest activity. Differences between age cohorts (mature and callow) are not statistically significant. Probabilities, mean ± s.d.; n = 6 colonies. See table 1 for statistical details. Diamond, mature; triangle, callow; square, total.
