Extended Data Fig. 3: Helpers were more likely to help at kin nests than at nonkin nests when both options were available.
From: A cryptic role for reciprocal helping in a cooperatively breeding bird
a-d, Bars show proportion of cases with nonkin helping when kin nests were also present for resident males (a), resident females (b), immigrant males (c), and immigrant females (d). Estimates of kinship bias are shown for varying thresholds for defining ‘kin’ (a kinship threshold of 0.1 means relatedness above 0.1 is ‘kin’ and relatedness below 0.1 is ‘nonkin’). The unweighted average probability of nonkin helping across the four helper types ranged from 44% with a kinship threshold of 0.05% to 40% with a kinship threshold of 0.5.
