See the paper here:
Paczolt KA, Jones AG (2010) Post-copulatory sexual selection and sexual conflict in the evolution of male pregnancy. Nature 464:401-404. doi:10.1038/nature08861
See the paper here:
Paczolt KA, Jones AG (2010) Post-copulatory sexual selection and sexual conflict in the evolution of male pregnancy. Nature 464:401-404. doi:10.1038/nature08861