TY - JOUR T1 - Variation in helper effort among cooperatively breeding bird species is consistent with Hamilton鈥檚 Rule JO - Nature Communications UR - http://eprints.whiterose.ac.uk/104221/ PY - 2016/08/24 AU - Green JP AU - Freckleton RP AU - Hatchwell BJ ED - DO - DOI: 10.1038/ncomms12663 PB - Nature Publishing Group VL - 7 Y2 - 2025/03/13 ER -