Approximately, around the time that last dinosaurs disappeared, monkey-like animals are said to have evolved from some ancestors who were more or less similar to the modern lemurs. Around some 4 crore years ago, the tail of these monkey-like animals of Africa is said to have disappeared. They developed due to enlargement in the brain and their hands also improved, thus evolving ape-like animals. Meanwhile, these ape-like animals reached the South and North-East Asia and at last evolved into gibbon and orangutan.