Yes, the largest known animal to currently swim the ocean is the blue whale.
In fact the blue whale is the largest known living animal in existence today both on and off land.
The blue whale can be found traveling through all of the worlds major oceans and its large body and thick layer of blubber make it ideal for surviving and thriving in cold climates such as the Antarctic Ocean as well as in environments such as the Atlantic Ocean, Indian Ocean and Pacific Ocean.
This marine mammal can reach lengths in excess of 100 ft. (70 – 90 ft. on average) when fully grown and weigh more than 180 tons (100 – 150 tons on average)!
To get a better idea of this whales massive size the blue whale measures more than an official NBA basketball court which measures in at 94 ft. long or if you compared it to the size of a football field which measures 360 ft. long the blue whale would measure in at roughly 1/4 the size of an official football field.
Even the children are big measuring in at around 20 – 25 ft at birth.
Despite its massive size and streamlined body this whale generally travels no more than 5 mph.
Baby blue whales are able to consume as much as 150 gallons of milk per day and gain as much as 200 pounds per day during its first year!
In regards to this species (actually in regards to most baleen whales) the female whale typically grows to be larger than their male counterparts.
In order to maintain its size an adult blue whale may consume as many as 40 million krill per day, which equates to around 8,000 lbs. of food daily.
The krill itself is relatively small in size measuring in at around 1 – 2 centimeters on average although some krill can reach lengths of around 6 inches.
In addition to its massive size this whale is also one of the loudest living animals.
One of the most popular sounds made by this whale is known as a whale song which is produced during mating season and is believed to be a primary tactic used to attract a mating partner.
During mating season these songs can be heard many miles away and whales may be heard singing in synchronicity to these songs changing their pitch and notes in harmony.
The blue whale gets its name from that fact that it appears to be completely blue when submerged underwater despite its grayish blue skin tone when it is at the surface.
Blue whales are largely solitary animals and often prefer to travel either alone or in small pods.
The largest formations of blue whales tends to occur either during periods of feeding or mating.
Due to their large size the blue whale does not have any natural known predators other than occasional attacks made by killer whales, however most adults are usually too large to be successfully attacked so the killer whale may target a young whale or baby in the hopes of obtaining a meal by separating the young whale from its protective pod.