Blue whale (Balaenoptera musculus) belongs to class Mammalia and are found in all oceans of the world, native to Arctic, Indian, Atlantic and Pacific Oceans.They are found in the temperate / tropical / polar salt water. Blue whales are slate to grayish blue in color with lighter spots on its body. They are the largest animals ever existed on earth. Its average length in adult is 25m. Its young ones born in warm, low latitude waters in the winter season. They sexually mature in about five years.They can swim upto 48 km/hr. Blue whales are filter feeder and its diet is principally crustaceans. Adult whales can ingest three to four tons of crustaceans per day. This specie is declared as "endangered" and is listed in Appendix I of both Convention on International Trade of Endangered Species (CITES) and Convention on Migratory Species (CMS).

Whale species of Pakistan

Fin whale
Balaenoptera physalus
Bryde's whale
Balaenoptera edeni
False killer whale
Pseudorca crassidens
Melon-headed whale
Peponocephala electra
Dwarf sperm whale
Kogia simus
Humpback whale
Megaptera novaeangliae
Blue whale
Balaenoptera musculus
Goose-beaked whale
Ziphius cavirostris