title: Sperm competition: evolution and mechanisms.
authors.affiliation: Department of Animal and Plant Sciences, The University of Sheffield, Sheffield, United Kingdom.
authors.forename: T R
authors.initials: TR
authors.lastname: Birkhead
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D005075:Biological Evolution; D001717:Birds / Q000502:physiology; D005260:Female; D005306:Fertilization / Q000502:physiology*; D008297:Male; D012727:Sex Characteristics; D012726:Sexual Behavior, Animal / Q000502:physiology*; D013084:Sperm-Ovum Interactions / Q000502:physiology*; D013094:Spermatozoa / Q000502:physiology*