A well-known easter egg from [Predator 2][1] is the presence of an [Alien][2] skull in the trophy case on board the Predator ship. Aside from a couple of human skulls, there are 4 others:

![A man in a light-brown-coloured jumpsuit stands in front and slightly to the right of a display.  The display contains an assortment of white skulls mounted on a darker background.  There are two human-looking skulls, one with a spine attacked and a long xenomorph skull, but 4 other skulls, ranging from twice the size of the human skull to larger than the man's torso, are circled in red.  They all have lots of teeth.][3]

And here's a close-up of the two skulls abutting the Alien skull:

![Close-up of the upper-right portion of the display, showing the skulls on either side of the xenomorph's.  The one on the right appears to have eyes set nearly on the side of a very broad face bone with a fan of bones reaching the upper jaw between two enormous ridges that may end in tusks.  There appears to be a fan of bones at the crest of the head.  The one on the left looks more like a predator, but it may have four eye sockets.][4]

Can any of these skulls be identified as either homages to other sci-fi creatures (like the Alien skull) or belonging to creatures appearing in any of the subsequent Predator comics, books, or other movies? Or are they simply props appearing in just this one movie?


  [1]: https://www.imdb.com/title/tt0100403/
  [2]: https://www.imdb.com/title/tt0078748/
  [3]: https://i.sstatic.net/cx1vy.png
  [4]: https://i.sstatic.net/BaP5b.png