Why most animals don't have periods Jul 21, 2016 19:55:15 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by eleventhson on Jul 21, 2016 19:55:15 GMT -5 curiosity.com/paths/why-most-animals-dont-have-periods-dnews/?utm_source=facebookSCA&utm_medium=social&utm_campaign=2016q3xxfbk03SCALanimalmenstrate#three-surprising-questions-about-periods-gross-science