Visceroids were disturbing creatures that sometimes form when organic life dies to Tiberium exposure. As flesh breaks down after death, it has the potential to mutate into a visceroid, a crude Tiberium-based life-form. Visceroids often appeared to be blob-like masses of flesh that sometimes had a few recognizable features from those they once were left over within their structure, and were highly erratic in nature. Some types were even capable of combining their biomass to essentially make a larger visceroid. One of the first mutated creatures to appear, the visceroid was encountered as early as the First Tiberium War.