 Over on NPR they have a short article about the Ripley's Believe It Or Not Museums. One of the things in one of the museums is this elephant head which has (had) two functioning trunks. I don't know if they have the whole elephant preserved or just the head. I'd say the two trunks occured from a natural mutation because I can't think of very many nuclear reactors in Africa except maybe in South Africa. The other interesting thing is that the trunks are one on top of the other instead of side by side as artists usually draw mutations (like double trunks).
Read the full article and check out a larger photo of the double trunked elephant for yourself. Source: NPR.org | 
