A gigantic lump of fat and human waste lodged into the sewer system, the fatberg is a rich biological database of human and non-human relationships. Incrementally growing and consuming the excess of our everyday lives, it transforms into a living, breathing entity; a complex landscape ecology of the Anthropocene. A study of this “creature” demonstrates the entangled nature of the fatberg as a complex ecosystem that operates at both the scale of the city and at the micro level of the microorganism.