Abstract
Three orders of mammals have completely subterranean representatives, the rodents, the insectivores, and the marsupials. The latter contains only one subterranean mammal, which is the sole form of this kind from Australia. All of the other continents have subterranean rodents and all but South America have subterranean insectivores. A brief review is given in this paper of the different types of burrowing mammals, of the their characteristics and their distribution. The Bathyergidae and Chrysochloridae of Africa are dealt with in rather more detail than groups found in other parts of the world.