The Muppets are mix of different species. Some are ostensibly human (or at least the Muppet versions of humans), like [Statler and Waldorf][1].

[![enter image description here][2]][2]

Some belong to other subsets of the animal kingdom, like [Kermit the Frog][3], who didn't object when he was described as a frog by Ellen DeGeneres, and was apparently born in a swamp.

[https://www.youtube.com/watch?v=1_AUn5poOmA][4]

And some are alien, like [Gonzo][5], whose extraterrestrial origins were revealed in _[Muppets from Space][6]_.

[https://www.youtube.com/watch?v=Lx2jYCltuQo][7]


  [1]: https://en.wikipedia.org/wiki/Statler_and_Waldorf
  [2]: https://i.sstatic.net/0ZVoU.jpg
  [3]: https://en.wikipedia.org/wiki/Kermit_the_Frog
  [4]: https://www.youtube.com/watch?v=1_AUn5poOmA
  [5]: https://en.wikipedia.org/wiki/Gonzo_(Muppet)
  [6]: https://en.wikipedia.org/wiki/Muppets_from_Space
  [7]: https://www.youtube.com/watch?v=Lx2jYCltuQo