TY  - RPRT
TI  - Evolutionary biology: Why do birds engage in extra-pair copulation?
AU  - Simon C Griffith
AU  - Robert Montgomerie
PY  - 2003
DO  - 10.1038/422833a
UR  - https://pubmed.ncbi.nlm.nih.gov/12712192/
ID  - 12712192
ER  -