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Sperm Numbers as a Paternity Guard in a Wild BirdInnate and adaptive immune proteins in the preen gland secretions of male house sparrowsThe role of male body size in mating success and male–male competition in a false widow spiderThe Italian Job Part 2Experimentally testing mate preference in an avian system with unidirectional bill color introgressionMolecular Diversification of the Seminal Fluid Proteome in a Recently Diverged Passerine Species PairNo microbes? No problem…or is there?: Developmental trajectory of germ-free House Sparrow nestlings.Reproductive coordination breeds success: the importance of the partnership in avian sperm biologySperm Sizer: a program to semi-automate the measurement of sperm lengthScientists' warning on climate change and insectsHighly variable sperm morphology in the masked finch (Poephila personata) and other estrildid finchesThe Italian JobExtensive transgressive gene expression in testis but not ovary in the homoploid hybrid Italian sparrowThere and back again: A sperm's talecode from: The role of male body size in mating success and male–male competition in a false widow spiderA systematic map of studies testing the relationship between temperature and animal reproductionSperm length variation among Afrotropical songbirds reflects phylogeny rather than adaptations to the tropical environmentOn the Origin and Evolution of Sperm Cells (editorial)Systematic approaches to assessing high temperature limits to fertility in animalsLongitudinal covariation of testosterone and sperm quality across reproductive stages in the zebra finchThe reproductive microbiome: an emerging driver of sexual selection, sexual conflict, mating systems, and reproductive isolationA role for regulation of gene expression in hybridization derived novelty.Special Issue "Origin and Evolution of Sperm Cells—An Issue in Honor of Geoff A. Parker"Reproductive Microbiomes and the Sexual Transmission of Beneficial Microbes: Reply to Lombardo et al.Variation in female reproductive tract morphology across the reproductive cycle in the zebra finch