Sometime during the many millions of years that have elapsed since mammalian faunas came into existence, some sort of island crossed from West Africa to South America.
Louis LeakeyAs a social anthropologist, I naturally accept and even stress the fact that there are major differences, both mental and psychological, which separate the different races of mankind. Indeed, I would be inclined to suggest that however great may be the physical differences between such races as the European and the Negro, the mental and psychological differences are greater still.
Louis Leakey