Competing with monkeys
Fifty million years ago, there were lemurs and other prosimians not only in Madagascar, but in Europe and North America. Around thirty million years ago, Madagascar became separated from the continent of Africa, where more advanced primates evolved. These primates never reached Madagascar, and lemurs survive today. Elsewhere, lemurs died out, being unable to compete with the monkeys. Since monkeys with the single exception of the South AmericanDouroucouli (Aotus trivirgatus), are diurnal, other prosimians which are nocturnal have been able to co-exist with the monkeys.