SCP-250 is the animate fossil skeleton of an allosaur (originally identified as Allosaurus fragilis; however, an incomplete scientific article found in the personal effects of paleontologist Dr █████████ indicates that this classification may have been erroneous). It consists of 153 disarticulated bones, and 14 plaster-and-fiberglass replacements, held together and animated by an unknown force. Study of this force is hindered by SCP-250's aggressive behavior, which has been assessed by Foundation palaeozoologists as being well within theoretical norms for an allosaurus.

SCP-250 emulates what are presumed to have been the standard daily activities of a living allosaurus: it wanders its enclosure by day, enters a state of dormancy by night, and will attempt to kill and devour anything which it perceives as suitable prey, including humans. Its lack of organs does not seem to affect its behavior in any way, except in that the remains of any prey it consumes will inevitably fall out of the gaps in its skull, neck, and ribcage, at which point it ignores them.

SCP-250 was first excavated as an 80%-complete skeleton in [REDACTED], 19██ ; records from the excavation do not include any report of anomalies. In 19██ , it was transferred to the ████████ Museum of █████████████ in [REDACTED], where it was assembled, mounted, and put on display.

On the night of ██/██/20██, SCP-250 seized and killed an intruder to the museum. Although damage to the intruder's remains was so extensive as to render forensic identification impractical, they were conclusively shown to not be those of paleontologist Dr █████████, whose office in the museum was extensively vandalized that night and who has not been seen since. Foundation personnel embedded within museum staff reported the incident, and SCP-250 was taken into custody.