blue whale, (Balaenoptera musculus), the most massive animal ever to have lived, a species of baleen whale that weighs approximately 150 tons and may attain a length of more than 30 metres (98 feet).

The blue whale (Balaenoptera musculus) is a marine mammal and a baleen whale. Reaching a maximum confirmed length of 29.9 meters (98 ft) and weighing up to 199 tonnes (196 long tons; 219 short tons), it is the largest animal known ever to have existed.

A marine mammal that belongs to the baleen whale suborder is the blue whale, also known by the scientific name Balaenoptera musculus. With lengths up to 100 feet and weights up to 200 tons, it is the biggest mammal on Earth. The world’s oceans are home to these enormous creatures, which are distinguished by their striking blue-gray coloring.

The blue whale (Balaenoptera musculus) is the largest animal ever known to have lived on Earth. Blue whales are found in all oceans worldwide and are separated into populations from the North Atlantic, North Pacific and Southern Hemisphere.

The blue whale is a type of baleen whale that, depending on the time of year, is found in oceans all across the globe. Its scientific name is Balaenoptera musculus.