Jean Tyler, age 14, of Newport Beach, Calif., for her question:

WHAT IS THE WORLD'S BIGGEST ANIMAL?

Can you imagine an animal 91 feet long that weighs about 140 tons? That's the size one gray whale reached, and he won for his species the title as the world's largest living animal. Monsters 50 to 65 feet long are not uncommon, although there are 100 different kinds with some measuring only six feet. They are air breathing mammals, not fish.

"There she blows" is a whaler's cry when he spots a whale surfacing and breathing out air from his lungs through a blowhole on his head. The warm air vaporizes when it reaches colder surface air, looking like a spout of water. The whale then fills his lungs with fresh air and is ready to submerge again for an up to 20 minute underwater stay.