The external ear-flaps of many mammals aid hearing by concentrating sound waves.

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"It is only among mammals that ears become noticeable, even striking, because of the visible external ear-flaps behind the narrow opening of the outer ear tube…The most obvious use of the ear-flap, though not necessarily the most important, is to gather and concentrate sound waves." (Foy and Oxford Scientific Films 1982:167)

The grand design: Form and colour in animalsBLA Publishing Limited for J.M.Dent & Sons Ltd, Aldine House, LondonAugust 4, 1983
Sally Foy

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