The sperm whale has large white teeth in its lower jaw and none at all in the upper.

It has only one blowhole, and that a little one, much farther forward on its head, so that sailors can tell, at a great distance, what kind of whales they see simply by their manner of spouting.
The most remarkable feature about the sperm whale is the bluntness of its clumsy head, which looks somewhat like a big log with the end sawn square off, and this head is about one-third of its entire body.
The sperm whale feeds differently from the right whale.

He seizes his prey with his powerful teeth, and lives, to a great extent, on large cuttle-fish.

Some of them have been seen to vomit lumps of these cuttle-fish as long as a whale-boat.

He is much fiercer, too, than the right whale, which almost always takes to flight when struck, but the sperm whale will sometimes turn on its foes and smash their boat with a blow of his blunt head or tail.
Fighting-whales, as they are called, are not uncommon.