I beleve that killer whale families are called flukes. Did this help?
They have shark tails. If they have shark tails then they'd be catagorized for a shark. They are called a whale shark because their big like a whale and shark because it is a shark (tail)
Some are e.g. liver flukes, but others are not e.g. a whale's fluke.
A whale's tail is called its flukes. The flukes are used in swimming
Blue whales' tails, also called flukes, are around twenty-five feet wide.
It moves its flukes up and down.
Whales' front limbs are called fins. Only some whales have back limbs, which are very small. The tail is divided into two extensions called flukes. Most whales also have a dorsal fin.
The Blue Whale has a small Dorsal Fin as well as its Flukes (tail) and its Flippers.
try looking here: http://en.wikipedia.org/wiki/WhalesA good deal like big fish, but with one difference. Fish tails are vertical; that is, they stick up and down but are quite narrow from right to left. Whale tails are horizontal, the flukes sticking out to the sides.
Individual animals are identified by the patterns under their flukes (tails).
because of the tail whale tails are horizontal and shark tails are vertical
'Fluke' is the term for the lobe of a whale's tale, usually used as a plural. One would say, "look at the whale's flukes."