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The subject matter of this article contains in-development information that was cut from the final version of an official and/or canonical source and appears in no other canonical source. It may also contain incomplete information since not all cut material is publicly known.
 Yellow Alien Fauna
This unnamed variant was to have a sack made of translucent polygons with visible feathery organs. Shooting this sack was to cause the creature to come crashing to the ground, helpless.
A flocking creature, it was to use stun gas from vents located on its back to disable the player, similar to the concussion grenade from Team Fortress Classic. Once the player was stunned, these creatures were to change tactics and all rush in, attempting to deliver a fatal sting with their long tails.
It was to have a feeding tube extending once the prey has been subdued, with a stinger at its end. Groups of these creatures were to be seen all with their tubes extended, tethering them to their dead prey "like a hellish balloon".
 Sewer Fauna
This variant named "Sewer Fauna" was to have a body length of around five feet, just enough to pin a human underneath its mouth. It was to have a thin, whippy tail and floppy pouches, and a transparent membrane between its four front legs. All movement it was to make was to be accomplished by leaping from point to point, using its whole body as a spring.
This creature bears some resemblance with the Facehugger from the Alien film series. Indeed, Ted Backman cited the work of H.R. Giger, creator of the Xenomorph from Alien, as one of his inspirations when designing creatures.