Spider-mouse
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Not "spider" as in "spins webs", but rather as in "the males die after mating". Also they're marsupials, not placental mammals, but that's still pretty novel. And kind of heart-wrenching TBH.
https://theconversation.com/doing-it-to ... mice-18884
https://theconversation.com/doing-it-to ... mice-18884