It steers and helps with stability
Yes
The dorsal fin is the fin on the back of a swimming animal's body. It helps the creature steer through the water like a rudder. A orca, or killer whale, has a very tall dorsal fin. The dorsal fin of the male is taller than the dorsal fin of the female. The male's dorsal fin can reach a height of seven feet, while the female's fin can be 5 feet tall. Killer whales in the wild have dorsal fins that stick straight up in the air. Almost all killer whales in capitivity have dorsal fins that droop over like a floppy dog's ear.
Orcas, also known as Killer Whales, have dorsal fins. Beluga whales do not.
A killer whale is a large, black and white form with a medium-sized white eye patch, living in open water. It also has a dorsal fin.
A Male killer whale has a taller more erect dorsal fin that the female, it also has larger paddle like flippers. The males are also larger in general with lengths of 9 metres.
the dorsal fin
yes===========================================================No, they don't. The knifefishes of the order Gymnotus, or South American knifefishes (electric eel, ghost knife fish, banded knife fish, etc.) have no dorsal or pectoral fins.There are about 150 known species.
The female killer whales dorsal fin is shorter then the males. The male killer whales dorsal fin is about 6 ft tall
yes
A whale group with dorsal fin and a series of grooves along the throat and chest is: rorqual
the males dorsal fin is strait and tall on the back of the dorsal fin and little curved in the front,the females dorsal fin is curved both sides
BALAENOPTERIDAE (Fin-backed Whale Family)