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Think and write how animals could hear without external ears

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Answer:-
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The external part of the ear is called the "pinna", and only MAMMALS have it. In fact not even all mammals: the most "primitive", the monotremes (egg-laying mammals -- platypus and echidna) don't have ears with a pinna.
However, without those outer-ears, it should be near-impossible for birds to tell which direction a sound is coming from. ... When they hear a sound, they TILT their head in the GENERAL direction their specialized eardrums indicate, and then let their sharp vision TAKE over, SWEEPING an area for the source.
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