The stealthy locomotion of the lorises is seen to be directly related to catching prey such as insects and roosting birds. The method of stalking prey contrasts strongly with the quick leaping method of food-catching presented by the galagos. The lorises, by virtue of their food-catching habits, are restricted to true forest, whereas some of the galagos, by the same token, have colonized more open country. This throws some light on the nature of the post-Miocene link between Africa and Asia and is suggested as a reason why the galagos are restricted to Africa whereas the lorises are found in both Africa and Asia.