3. Name the ring of cartilage found in birds.
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The trachea are covered in partly ossified rings known as tracheal rings. Tracheal rings tend to be complete, while the bronchial rings are C shaped and the unossified part has smooth muscles running along them. The trachea are usual circular or oval in cross section in most birds but are flattened in ibises.
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>The trachea are covered in partly ossified rings known as tracheal rings.
>Tracheal rings tend to be complete, while the bronchial rings are C shaped and the unossified part has smooth muscles running along them.
>The trachea are usual circular or oval in cross section in most birds but are flattened in ibises.
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