……objective science for conservation…….

The Pacific WildLife Foundation is a non-profit coastal and marine research and education society  that inspires an appreciation for objective scientific research and conservation of the ocean. We conduct original research, develop novel education programs, and inspire an appreciation for conservation of the ocean. 

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Blue Whale Balaenoptera musculus

The blue whale is the largest animal to have ever lived on Earth. It weighs up to 136,000 kg and is as long as 34 m. It is pale blue-gray in colour with a tiny dorsal fin. Blue whales occur in cold and temperate regions where the water is deep. They travel alone, as mother and calves, and rarely as adult pairs. Only occasionally do they gather in loose groups to feed. The blue whale is found in all the oceans of the world. The blue whale is known to occur in the Arctic, Atlantic, Indian, and Pacific oceans. .  There are three subspecies.  B. m.  intermedia occurs in Antarctic waters, B. m. musculus is found in the northern hemisphere and B. m.  brevicauda also known as the pygmy” blue whale is found in the southern Indian Ocean and southwest Pacific Ocean. The number of blue whales was greatly depleted by commercial whaling before 1964.

Blue Whale Facts

Length: 23 - 24.5 meters

Weight: 100 - 150 tons

Food: krill

Breeds every 2-3 years

Gestation: 12 months

Newborn: 7 - 8.2 meters long

Social Status: Commonly found in singly or in pairs

IUCN Red List Status: Endangered



Rice, D.W. 1998. Marine mammals of the world: systematics and distribution. The Society for Marine Mammalogy. Allen Press, Lawrence, Kansas.

Wilson, D. E. and S. Ruff 1999. Smithsonian book of North American mammals. UBC press, Vancouver.








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