The most likely reservoir is migratory fruit bats, who spread it through guano and being eaten (considered a delicacy).
That's why Ebola and Marburg showed up in rainy weather, near caves and mines, or was contracted by people out hunting, if not contracted from other victims. The hit-or-miss nature of being infected by the migratory bats was why the outbreaks were scattered and seemingly unrelated.
Most of the Ebola outbreaks, I have learned, comes from the eating of infected “bushmeat.” Such meat from wild animals is poached and brought into the cities to be passed off as pork or beef. Kuru is also caused by eating meat. In the case of Kuru, the meat is other human beings. Most likely, the humans are Christians being sacrificed to Allah.
We are fortunate to live in these time in the United States where I can be certain the BBQ’d pork ribs I ate tonight were from pork.