watch the video here: https://www.youtube.com/watch?feature=player_embedded&v=OB0UtOxwEWU
3: 10 to 3:40
Twins (or triplets, so on) are damned according to the Antambahoaka people. Therefore, they are abandoned to die in the forest or fields. It is said that if they were kept in the family, the other members would get sick and die.
So to get rid of the malediction or taboo, they are abandoned or else sometimes they are put at the gate of the barn, the zebus tread them when they get out, but if the children survive they are taken back into the family. Sometimes the family hide them and they are just separated from birth, so they can survive in different villages or families.