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The notion that allopreening reinforces pair bonds has gained widespread acceptance (e.g., Harrison and Harrison 1997; Dagg 2011; Mandal 2015), but to date this hypothesis has been examined in only a handful of species.

In buff-breasted wrens , allopreening appears to play no role in pair bond maintenance (Lewis et al. Outside the pair bond, evidence for a social function of allopreening comes from studies of cooperatively breeding green woodhoopoes , which have been reported to increase allopreening among group members following territorial conflicts with neighboring groups (Radford 2008; Radford 2011).

In addition, to confirm the effects obtained from the separate models, we also ran a full model containing all predictors on a subset of 37 species for which information on all variables was available.

Allopreening between partners was also no more common in colonial or cooperatively breeding species than in solitary species.

However, the lack of detailed observations for most species denies us a broad understanding of variation in allopreening across birds, and in particular, how it might influence the establishment and reinforcement of social relationships between breeding partners.

Here, we carry out a comparative analysis of allopreening within breeding bird pairs, testing the hypothesis that across species the presence of allopreening is associated with strong pair bonds.

In a comparative analysis of allopreening and pair bond behavior, we found that allopreening between breeding partners was more common among species where parents cooperate to rear offspring.

The occurrence of allopreening was also associated with an increased likelihood that partners would remain together over successive breeding seasons.

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  1. Jun 9, 2017. Behavioral Ecology, Volume 28, Issue 4, 1 August 2017, Pages 1142–1148, https//doi.org/10.1093/beheco/arx078. Published. This work was supported by a University of Sheffield Animal and Plant Sciences PhD Scholarship to E. K. and a research grant from the Natural Environment Research Council.

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