black horse a lot of rats

At four in the afternoon, SCP-027's outline began to shift. This was immediately reported by the guards on duty, who relayed it to the higher-ups. It stayed like that, little tremors, for a minute longer.

Then its clothes burst, and out came the mice.

No one could possibly imagine where they came from. They formed waves and pools and little rivulets on the floor, climbed the walls, slid through the grated floors and clogged up the intake for the incinerator. Then they climbed one another, forming a fungus-like, agouti-and-black mass in the center of the cell. The guards watched, horrified, as the host of 027 was lifted. He faced the plate-glass wall, with his arms held out- beseeching, Christ-like. His mouth was ripped and spotted with with bloody, tiny mousetracks.