Do you know that manatees possess vocal chords which give them the ability to speak like humans, but don't do so because they have no ears with which to hear the sound.

     Manatees are large, fully aquatic, mostly herbivores Marine mammals sometimes known as sea cows.
     Manatees are typically found in shallow coastal areas and rivers where they feed on sea grass, mangrove leaves, and algae. These herbivores munch on food for almost half the day, eating ten percent of their body weight in plant mass every day. With weights of up to 1,200 pounds, that is a whole lot of greenery.
     West Indian ( Trichechus manatus ) and West African (T. senegalensis ) manatees spend their lives on the cusp between salty and fresh water. They are able to maintain the correct balance in their bodies through an internal regulation system that works with the kidney to make sure salt concentrations never get too high. It is believed that West Indian manatees require some access to freshwater (PDF) in order to stay hydrated, but they are able to easily move between the two ecosystems.
     Manatee brains are smooth (compared to our own that have the familiar ins and outs of cortical folds) and the ratio of their brain to their body size is the lowest of any mammal . They may not be as clever as dolphins, but manatees can learn basic tasks, are extremely sensitive to touch and can differentiate colors.