Teunissen, N., Kingma, S. A., Hall, M. L., Hidalgo Aranzamendi, N., Komdeur, J., & Peters, A. (2018). More than kin: Subordinates foster strong bonds with relatives and potential mates in a social bird. Behavioral Ecology, 29(6), 1316-1324. doi:10.1093/beheco/ary120.