Fluke (Tail)
The gray whale's fluke is horizontal. The tail is about 12 feet (3.6 m) across, which is roughly equal to about one-fourth of the whale's entire length. The fluke is pointed at the tips, and deeply notched in the center. It looks rather like a flattened, pointy valentine. The tail-flukes alone weigh 300-400 lbs. (136-180 kg).

Image: Bree Witteveen