A colubrid (from Latin "coluber", snake) is a snake that is a member of the Colubridae "family". Colubridae is the largest snake family, and includes about two-thirds of all known living snake species. However, colubrids are "certainly not a natural group", and many are more closely related to other groups, such as elapids, than to each other. This family has classically been a dumping ground for snakes that do not fit anywhere else. There is on-going mitochondrial DNA research which will sort out the familial relations within this group.