 SCP-401 was discovered near the French city of R... when agents responded to reports of what at first appeared to be a 40 meter tall dead eucalyptus tree, with branches shaped like multi-jointed human arms. Though it is genetically a human male, it will grow female sexual organs. Five days after the formation of the organs, menstruation occurs, at which point male sexual organs begin to develop in their place over a period of 10 days. During this phase, SCP-401 will attack human females for the purpose of reproduction.