Who's the daddy? There isn't one.

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A snake. A shark. They got pregnant with no male involved. In fact, scientists are finding more and more species that can reproduce on their own. What’s going on? Note: We mention that a stingray named Charlotte might be pregnant via parthenogenesis. It has since been announced that she was not pregnant, but ill. For show transcripts, go to vox.com/unxtranscripts For more, go to vox.com/unexplainable And please email us! unexplainable@vox.com We read every email. Support Unexplainable by making a financial contribution to Vox: vox.com/givepodcasts Please take a second to help us learn more about you! vox.com/podcastsurvey Learn more about your ad choices. Visit podcastchoices.com/adchoices