[...The tombs of the Mahafaly attract a great deal of interest. They are big rectangular constructions of uncut stone rising some three feet above the ground and decorated with aloalo and the horns of the omby (cattle) slain at the funeral feast. The tomb of the Mahafaly king Tsiampody has the horns of 700 zebu on it. The aloalo are sculpted wooden posts set upright on the tomb, often depicting scenes from the person's life. The burial customs include waiting for the decomposition of the body before it is placed in the tomb. It is the practice for a person to be given a new name after death-generally beginning with 'Andria'....]
the above text is taken from the following website:
http://www.anthrotech.com/madagascar/culture/