Africa has the greatest linguistic diversity in the world with more than 2,000 living languages. There are only 250 among Nigerians, for example.
The most widely spoken languages are: Arabic (over 150 million speakers), Kiswahili (over 100 million), Amharic (between 28 and 50 million), Hausa (between 18 and 50 million), Yoruba (30 million) if we exclude the languages introduced in Africa.