Why do African elephants have bigger ears than Indian elephants?

African elephants have larger ears than Indian,or Asiatic, elephants because they live in hotter conditions and are bigger and more aggressive and active. The huge ears of the African elephant,sometimes three and a half feet wide,enable it to hear more acutely. When the animal charges it fans out its ears,augmenting its terrible appearance and striking fear into the heart of any enemy. The ears also present a large surface for losing body-heat. African elephants,who are at a disadvantage in the heat because of their size,wave their ears to keep cool and to chase away flies.