Manatees have thick pads around their lips and stiff bristles that help them grab food and move it towards the mouth. A manatee eats sea grass and all kinds of sea vegetables. All its teeth are shaped like a human's molars. The eight hours of chewing each day wears down on their teeth. In fact, its first two pairs of teeth get so worn out that they simply fall out sometimes. However, manatees can grow new teeth. New teeth are always growing in the back. When front teeth fall out, the back teeth move forward to take their place. In mammals, only elephants and (quite independently) kangaroos have this kind of system.
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