According to his analysis of the Bachia family tree, the toed species re-evolved toes from toeless ancestors and, what is more, digit loss and gain has occurred on more than one occasion over tens of millions of years.

据他对 Bachia 家谱的分析，有脚的物种从没有脚的祖先重新进化出了脚，另外，头的得到在几千万年间不止出现了一次。