The tasks of dugong dugong are relatively degenerates; this Indo-Pacific species specializes on delicate seagrass. In manatees, in contrast, there is an indefinite large number of enamel covered, cementumless teeth, Each with 2 cross ridges and closed roots. As teeth at the front of the cheek to row wear out, they are replaced by posterior teeth pushing forward, a pattern similar to that in elephants except that shutting and replacement are not limited to the standard eutherian number of cheek teeth.

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