Galagos, also known as bushbabies, bush babies or nagapies (meaning 'little night monkeys' in Afrikaans), are small, nocturnal primates native to continental Africa, and make up the family Galagidae (also sometimes called Galagonidae). They are sometimes included as a subfamily within the Lorisidae or Loridae. According to some accounts, the name 'bush baby' comes from either the animal's cries or appearance. The South African name nagapie comes from the fact they are almost exclusively seen at night. Galagos are said to have evolved 40-50 million years ago from slow moving prosimians that could not compete with larger, faster primates in Africa. The competition was much less at night, so they evolved into the bush babies they are today. In both variety and abundance, the bush babies are the one most successful primitive primates in Africa, according to the African Wildlife Foundation.