They are adaptations to aid the animal in it's everyday life. African elephant ears are no more efficiant for hearing than Indian elephant's ears but they are much larger in external area. This is so...
it's actually the exact same reason for humans having all different shapes and sizes of ears, also, ex-a bats ears are tall and like a mini opera theatre, enBLING IT TO HEAR SOUNDS WELL, THATS WHY...
