TY - JOUR T1 - Extra-pair copulation and sperm competition in the zebra finch. JO - Nature PY - 1988/01/01 AU - Birkhead TR AU - Pellatt J AU - Hunter FM ED - DO - DOI: 10.1038/334060a0 VL - 334 IS - 6177 SP - 60 EP - 62 Y2 - 2024/12/22 ER -