Answer:
A spent round or a slimy critter.
What is the largest living ant on earth?
It can be white or blue or black, Humped or have a horn. And when it talks it sings its menuets, as it's travelling the depths.
What fish came first?
It can be in a hat, Or out of the bag. If you see it you'll be smitten, 'Cause it's fluffy like a mitten.
You can always see it, but it's too far away to touch. Mountains rest on it, and at sea it surrounds you. What is it?