Joint care can outweigh costs of nonkin competition in communal breeders.

Nestlings in noncommunal broods with a helper ( n = 12) also tended to have lighter body mass than those in communal broods, but this relationship was marginally nonsignificant (β ± SE = −0.69 ± 0.34, t 26 = −1.05, P = 0.06; Figure 4c ).

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