The smallest primate is the pygmy mouse lemur (Microcebus myoxinus) of Madagascar. It's head and body measures 2.4 in., its tail is 5.4 in. and an average weight of 1.08 oz. There are no antelopes, chimpanzees or lions on the island, there are lemurs. That's because the isolation of the island - 400 kilometers from mainland Africa - occurred 120 million years ago, before the ancestors of the lemurs and the other animals evolved.