the marsupials and the Australian flora and fauna that they represent. These species spread into Indonesia over land, at times of low sea levels during recent ice ages. Unlike the other examples in this tale, and for reasons unknown, their dispersal was stopped by narrow but deep ocean channels (perhaps there was not enough time to cross successfully, or the ecological niches on the other side were all occupied). Whatever the reason, a clear zoological and botanical line divides east from west Indonesia.
