Sexual Behavior, AnimalCannibalismEjaculationInseminationGenitalia, MaleGibraltarSperm TransportMating Preference, AnimalReproductionPreoptic AreaFertilityCompetitive BehaviorPregnanediolSex AttractantsGenitalia, FemaleSpidersPanstrongylusTephritidaeCourtshipConsummatory BehaviorCamelids, New WorldPapio hamadryasPenisPaternityOvipositionSpermatozoaWeevilsVocalization, AnimalBedbugsGryllidaeChiropteraPoeciliaTriatominaePair BondSperm CountDrosophila melanogasterClitorisCloacaCyprinodontiformesBeetlesSocial DominanceGroomingSex CharacteristicsPasseriformesConflict (Psychology)EstrusDisorders of Sex DevelopmentSemenAnimal StructuresBiological EvolutionGenitaliaSex RatioHydrocarbonsPupaSongbirdsLongevityOrchiectomyTime FactorsDipteraObservationBody SizeBirdsGanglia, InvertebrateTestosteroneInsectsBehavior, AnimalDrosophilaRats, Long-EvansSocial BehaviorVaginaLuteinizing HormoneAggressionMacacaGonadal Steroid HormonesAnimals, Genetically ModifiedDrosophila ProteinsOvaryMicrodialysisGenes, InsectCopulationPregnancySelection, GeneticMicroinjectionsSeasonsAnalysis of VariancePopulation DensityPregnancy, AnimalTestisSpecies SpecificityUterusDopamineExtracellular SpacePituitary GlandRadioimmunoassayGonadotropin-Releasing HormoneProgesteroneLinear ModelsOrgan SizeEstradiolPhenotype