What is the biggest animal in the sea?

Introduction

The blue whale (Balaenoptera musculus) is undoubtedly the biggest creature in the sea, and is in fact the largest animal to have ever lived on plant earth – a fully-grown blue whale is double the size of the largest land-dwelling dinosaur that ever lived. They can grow to an absolute maximum of 33 metres in length (108 feet) and weigh 200 tons (400,000lbs), although most blue whales are smaller than this, averaging around 20 – 25 metres when fully grown. The true size of a fully-grown blue whale lends itself to being described in facts and statistics:

The arteries of a blue whale are approximately 10 inches wide.
The tongue of a blue whale weighs 3 tons.
At 10ft in length the blue whale has the largest penis in the animal world.
Each testicle of the blue whale weighs around 150lbs.
The heart of a blue whale is approximately the size of a saloon car.
New born blue whales are around 6-8 metres long at birth.
Baby blue whales feed on their mother’s milk – and can drink 50 gallons a day, meaning they can increase their weight by 200lbs every 24-hours!
Despite its vast size the blue whale is a filter feeder, eating only krill and other minute sea creatures. They can eat around four tons of krill each day.
As well as being the largest animal in the world, the blue whale is also the loudest. Its call can reach almost 190 decibels – to put that into perspective hearing damage beings at under 100 decibels. The loud, low frequency calls of the blue whales are used to communicate with each other, and can be transmitted for hundreds, possibly thousands of miles through the oceans.