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Female mass development depending on their relatedness to the offspring (0, 33, 66 and 100% foster treatment) and for females without brood. Females caring for sibling broods (0 and 100% foster) lost weight and there was a difference with females of the 100% foster treatment losing significantly more mass than females caring for 66% foster offspring (a and b express the statistical difference, Wilcoxon multiple comparisons p < 0.05).
