The blue whale is the largest living animal in existence.
This massive marine mammal can reach lengths in excess of 100 ft. and weight more than 150 tons when it is fully grown!
Even their children are big and can easily measure in at over 23 ft at birth (which is comparable in size to a small adult killer whale).
Note: The killer whale is also the largest marine mammal in the dolphin family.
Despite the blue whales massive size its primary diet consists almost solely of krill, a tiny sea creature that measures in at a meager 1 – 2 centimeters on average (although some species of krill can reach a maximum length of around 6 inches).
In order to maintain their food supply (blue whales can consume as many as 40 million krill per day) these whales are often found in areas where krill is largely abundant.
Some of the locations blue whales can be found living in include Antarctica, the North Atlantic and North Pacific Oceans and the Indian Ocean.
Blue whales belong to the baleen whale suborder and are known as filter feeders.
These whales do not have teeth, instead they hunt their food by swimming towards it with their mouth open and engulf as many krill as possible.
They then expel the water from their huge mouth by pushing it out with their tongue while leaving the krill trapped inside their baleen bristles.
The baleen bristles look similar to the bristles found on a comb and act as a filter by allowing water to pass through the openings while remaining packed tightly enough to prevent food from escaping.
Interestingly despite this animals massive size they have relatively small throats, so small in fact (typically less than 12 inches) that it would be impossible for them to swallow an average sized person.
While these whales can be seen traveling in most of the worlds major oceans they tend to prefer cold climates particularly where large abundances of krill live.
When mating season comes around these whales travel 1,000′s of miles from their feeding grounds to their mating grounds and may completely forgo eating the entire trip which could last as many as four months.
Even during migration these whales are particularly laid back when it comes to swimming.
On average blue whales are known for traveling an average of around 5 miles per hour although they can reach speeds of up to 20 miles per hour when they feel threatened.
During mating season blue whales can be heard performing whale songs which are believed to be used by males to attract a female to mate with.
Once mating is complete it takes an average of 10 – 12 months for the female to give birth.
From what little is known about the blue whale mating habits it is thought that the female whale gives birth to a single offspring once every 2 – 3 years.