Mammalian herbivores can be divided into two groups on the basis of the principal site of microbial fermentation. Fore-gut fermenters have an expanded and differentiated fore-stomach. Eutherian fore-gut fermenters include sloths, colobid monkeys, hippos, peccaries, camelids and ruminants. Marsupial fore-gut fermenters include the kangaroos, wallabies and rat-kangaroos. Hind-gut fermenters have ...