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Purpose of Rabbit Ears
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The rabbits' long ears are its most prominent features. They aid in regulating body temperature and detecting sound. The ears are also a good indicator of how a rabbit is feeling and provide an excellent means of communication.
Communication
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Ears held flat against the head indicate an unhappy rabbit while ears that go down indicate a relaxed rabbit.
Medical Problem
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Another reason rabbit ears may droop down may be a medical condition. A drooping ear may be an indication of disease within the ear such as a bacterial infection. Drooping ears may be associated with other signs of illness such as head shaking, waxy ears and loss of balance.
Sign of Aging
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Rabbit ears tend to droop down as the animals get older. Rabbit ears may collapse due to weakness in the cartilage and bones structure, causing arthritis with age.
Genetics
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Finally, due to genetics, certain breeds have ears that naturally go down. Lop eared breeds such as the Holland Lop or Lionhead tend to have characteristically long droopy ears.
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Why Do Rabbits' Ears Go Down?
Rabbit ears go down for a variety of reasons. They may go down as a way of communicating. They may go down due to a medical condition, a sign of aging or simply genetics.