Animal

With four oars it swims but it is always at home. Its back is like armor, tougher than chrome. What is it?

related riddles

When I'm metal or wood, I help you get home. When I'm flesh and I'm blood. In the darkness I roam.

What spends the day at the window, goes to the table for meals and hides at night?

To you, rude would I never be, Though I flag my tongue for all to see.