Conjoined Twins in Polynesia?

My arrival to Easter Island was on the Soren Larson, a two-masted square-rigged sailing ship. We sailed from Panama via the Galapagos and I spent a delightful week on Easter Island before flying on to Tahiti and New Zealand. Along the way, I became intrigued with carved figures and petroglyphs that seemed to depict joined human beings which I took as textbook illustrations of conjoined twins. That experience, plus a search of the literature, has led to this paper. My interest stems from the ethical considerations involved in the care of six sets of twins (Raffensperger 1997:249-255). I was, however, unaware of artistic representations of joined human figures until I observed a terracotta statuette from Mexico in the Museo de Colon, Gran Canaria.