Answer:
With four oars it swims but it is always at home. Its back is like armor, tougher than chrome. What is it?
A king without a crown
Creeping on its belly, curled into a ring. Eyes forever open, beware its lethal sting
What do you call a rabbit with fleas?
What is that which, while it lives, constantly changes its habit, that is buried before it is dead, and whose tomb is valued wherever it is found?
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?