It is used for balance and to skim through the water easier
The fin on the back of an orca is called the dorsal fin.
An orcas dorsal fin (the fin on the back of a aquatic mammal, so times on a shark) can get to be 6 feet tall.
To maintain directional stability (steering) while moving through the water.
Yes. In October 2005, sixteen orcas attacked, killed, and ate a fin whale in the Gulf of California, Baja California, Mexico.
the female orca's dorsal fin is curved and the males dorsal fin is straight
The dorsal fin is the fin on the back of a fish, for example the typical triangular fin on the back of a shark is its dorsal fin.
well the females live up to 30 years and males live up to 50
Male orcas have huge, triangular dorsal fins that can grow up to six feet in height. Females and younger orcas have smaller, curved dorsal fins. See the picutre in the link.
Orcas, Blue Whales, and Fin Whales. There are many more.
Dorsal fin
The tail fins are 'flukes'. Otherwise the fin on any marine animal is "... fin" where "..,." is the adjective denoting its position on the body.
A swordfish has a fin on its back.