Mystery Animal of the Week #2

Our 2nd Mystery Animal 

     Hey guys, so sorry we were a little late on the mystery animal, but my computer wasn't working correctly.  So now we will give you the hints for our second animal of the week.

1. It's name means "river horse" in Greek.
2. They are among the largest living mammals.
3. Their canine teeth can grow up to 50 inches.
4. They are semiaquatic animals.
5. Lastly, they have very little hair.