 SCP-840 is a type of amoeba that thrives in dark, damp environments, which given the correct circumstances, will form a unique symbiotic relationship, fusing together by secreting an extremely viscous mucus. Although SCP-840 has a prolific growth and reproduction rate, colonies are capable of existing unnoticed for years. Scents and drainage systems are the preferred habitat of SCP-840. To date, there has only been one observed instance of SCP-840 colonizing a natural environment. See Incident Report 1840A1. Using the exterior of the pipe as an exoskeleton, SCP-840 will, over time, convert these systems into an extended digestive system, capable of extracting nutrients and moisture from passing biological matter.