Per 
Item #: SCP-XXXX
Object Class: Euclid
Special Containment Procedures: SCP-XXXX-1, -2, 3, and -4 must be kept in separate containment rooms. The containment rooms are all three meters in height, width and length, and are all located in the same large containment hall for the convenience of experimentation at site-XX. Personnel may not enter containment, and experimentation shall not be conducted without at least class 4 authorization.
Description: SCP-XXXX are four physically separate entities, seeming sapient in nature, assigned SCPs XXXX-1, -2, -3 and -4. They are thin, pale skinned, and lack all body hair. They seem to be related in species as they seem to communicate in an incoherent language comprised of seemingly random sounds and growls, and act in similar states of mind simultaneously.
Subjects are similar in appearance, however having multiple unique features in bone structure, having appendages and different holes in different parts of their bodies, most of which don't seem to be caused by physical harm. Subjects do not possess genitals.
Subject -1 has nearly human-like limbs, and is able to stand on it's hind legs for short periods of time. Subject -1 is agile, and has a light physique. It's hands are human like, with it's fingers ending on sharp digits. Subject -1 has almost no muscle mass, but seems to have very great upper body strength. Subject -1 has a face, with a prominent nose, but a seemingly mutilated mouth, with human-like teeth. Subject -1 does not seem to have eyes, but shows signs of sharp hearing, and a very sensitive sense of smell. Subject -1 shows signs of extreme aggression near personnel, but seems to be passive towards other subjects.
Subject -2 is unable to move on it's hind limbs, it lacks feet and has stubs on the ends of the shanks. Subject -2 has no other facial features other than a large prominent mouth covering most of it's face, with short but needle-like teeth, and a strong jaw, able to bite through hard materials, and even snap bones. Subject -2 is aggressive when provoked, but still seems passive to non provocative personnel. Subject -2 has an opening in the back of it's head, and on it's upper back. These openings seem to not follow basic geometry, as the openings on subject -2 don't seem to end to the borders of it's body, and light inside the openings doesn't seem to travel further than two meters. The origin of these openings is unknown.
Subject -3 has human-like hands and feet, and is able to stand on it's hind legs. It has a slouched posture, and it's back is filled with peculiar bone growths, and protrusions. it's only facial feature is a large hole in the middle of it's face, which is theorized to grant vision, and possibly to eat. It's bone structure is seemingly random, the bone protrusions and plating having no discernible pattern.
Subject -4 has seemingly cancerous growths everywhere of it's body. It has feet that are able to sustain standing on it's hind legs, however it's behavior shows that it prefers to use all it's limbs. Subject -4 has human like hands, and it has a slouched posture. Subject -4 has no facial features other than a mouth. Subject -4 is more passive than all other subjects, and is the most verbally active.
Addendum-XXXX-A: Subject -3s "hole" is apparently sensitive to light. This could be used for recontainment in possible breach scenarios.
