The Bougarabou is a traditional west African drum with a history that probably pre-dates the Djembe.  In many ways they are more like a Conga than a Djembe, and are often called "African Congas".  The internal shape is more like a Conga, plus bougarabou's have heaver calf hide heads, compared to the thin goat skins on most Djembes.  This gives Bougarabous a deeper richer tone that Djembes or Ashikos.  In the traditional manner, the hair is left intact on Bougarabous which makes for a very hand friendly drum, and makes the sound even more round and rich.