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   From: here@is.invalid   
      
   This adorable animal spends its entire adult life pregnant   
      
      
      
   Swamp wallaby females can remain pregnant through their entire adult   
   lifetimes.   
      
   Pregnancy can sometimes feel like it lasts forever, but for an   
   Australian marsupial called a swamp wallaby (Wallabia bicolor),   
   pregnancy truly never ends.   
      
   Researchers recently discovered that female wallabies can conceive   
   while still pregnant, implanting a new embryo — or two — days before   
   giving birth to an existing fetus — or two.   
      
   This creates a cycle of perpetual pregnancy that persists throughout   
   the wallabies' lives as sexually mature adults. It's also a   
   reproductive strategy that is one of a kind among mammals, scientists   
   reported in a new study   
      
   https://www.livescience.com/swamp-wallaby-always-pregnant.html   
      
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