What kind of animal is balaenoptora borealis?

Balaenoptera borealis, commonly known as the sei whale, is a large marine mammal belonging to the baleen whale family. It is known for its streamlined body and can grow up to 60 feet long. Sei whales primarily inhabit temperate and polar waters and are known for their speed and agility. They feed mainly on small fish and zooplankton by filtering them through their baleen plates.