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*In the '''Dog and Cat''' the C-Shaped rings are joined by muscle which is placed externally, rather than internally as is normal for the other species.
 
*In the '''Dog and Cat''' the C-Shaped rings are joined by muscle which is placed externally, rather than internally as is normal for the other species.
*In avian species the trachea is composed of tightly stacked rings of cartilage, which are complete with no dorsal space. They overlap considerably.
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*In '''avian species''' the trachea is composed of tightly stacked rings of cartilage, which are complete with no dorsal space. They overlap considerably.
    
==Links==
 
==Links==
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