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Blue Whale

Updated on February 24, 2016

Scientific Name: Balaenoptera musculus

Image courtesy NOAA
Image courtesy NOAA

Blue Whale Description

You may know so simple facts about the Blue Whale, but this fascinating animal has such a story to tell. We are still mystified by it due to the sheer size of it and how long it has been around. There is plenty that we don’t know due to where they live. They are realistically too large to keep in captivity and the cost of feeding them would be ridiculous to say the least.

Exploring the world of the Blue Whale is one that you will enjoy. Perhaps upon doing so you will discover for yourself why we all have a responsibility to help protect his animal. They are considered endangered at this point in time. Unless more people step in to help them though the outlook for their future here on Earth looks quite grim.

Blue Whale Anatomy

 It is easy enough to say that the Blue Whale is the largest animal in the world. Yet what does that really mean? It means that this creature is as long as a bus and that they are even larger than any dinosaurs that we know about. They can be more than 100 feet long and close to 200 tons in weight. They have many colors associated with them including variations of blue, green, and white. They have a long and slim body that allows them to move with ease along the ocean.

All Blue Whales feature two blow holes and that allows them to take in lots of air. They will be able to dive into the water for food and not come back up for close to an hour. Younger ones can’t stay under as long but as they get older their capacity will increase. Once of the interesting things to look at on their body is the grooves under the throat that run all the way to the middle of the bottom of the belly. These grooves are for the processing of food through a filtering system.

Blue Whale Evolution

 How did the Blue Whale come to be the magnificent animal that we have today? There are still many elements of that which we aren’t familiar with. There is evidence to indicate they have been around in some form though for more than 45 million years. They have been able to evolve into water animals from ones that were once able to walk on land. This has allowed them to survive in an environment where they can have all of their basic needs met.

Perhaps some day we will uncover more fossils of the Blue Whale which will provide us with the exact answers we seek. However, the focus now needs to be on keeping these animals alive instead of only a part of our past history. They aren’t able to evolve fast enough to keep up with all the changes that humans create for them.

Blue Whale / Photo taken by NOAA Fisheries
Blue Whale / Photo taken by NOAA Fisheries

Blue Whale Behavior

 Since we don’t get to have Blue Whales in captivity a great deal about their behavior is a mystery as well. They tend to do quite well out there as isolated creatures but occasionally they will be seen as a pair or in very small groups. They do get along well when they come into contact during migration, in search of food, or for mating purposes. They generally aren’t aggressive in nature towards each other.

There is no denying the loud calling sounds of the Blue Whale though. They can be heard for many miles away. In fact they are the loudest animal in the world. Many times it will sound like an eerie type of whistling that is coming from the water. This sound increases in volume and frequency during the mating season as well because they use these calls to find each other.

Blue Whale Habitat

 It is a myth that the Blue Whale only lives in the Indian Ocean. Such stories circulate though because this is where the vast majority of them are found. They do live in all the oceans around the world. They tend to stay in warmer waters though and they will live in deeper waters. That is why many people don’t realize that they are in the area because they don’t see them from the shore.

Blue Whales migrate in the winter months in order to find warmer water. During this period of time they can be found in places where they normally wouldn’t habitat. Migration patterns have been documented and many tourists travel to those areas in hopes of seeing these amazing animals as they move from one location to another.

Blue Whale Feeding Habits

 Blue Whales don’t much of a selection when it comes to the food that they eat. Instead they consume millions of krill every day. They will eat more in the summer than in the winter though. During the winter they are able to survive due to the amount of fat called blubber that they stored up over the warmer times of the year.

The filtering system that they have allows them to consume the food they need and to remove the items that they don’t include the water. This process is very complex but at the same time it is very intriguing to learn about.

Blue Whale Reproduction

 It is assumed that the Blue Whale reproduces just like other mammals in the water. We don’t know much about the specifics though due to the region where these animals are, deep in the waters of the ocean. They tend to be ready to mate about 8 to 10 years of age. A female will only have a pup every couple of years due to the fact that the mating season overlaps with the time of year when she will be ready to give birth.

It takes a full year from conception until they pup is born. It is ready to swim instinctively when it is born. They aren’t small and defenseless like some animals in the water. They are huge at a size of about 20 feet and about 3 tons in weight when they arrive. They aren’t ready to consume krill though until they are about six months old. Until that time they will survive off of the milk their mother’s produce.

They grow at an amazingly fast rate by gaining about 200 pounds a day. They will consume milk from their mother for the first six months of life before beginning to hunt for their own food. They will remain with their mother for about another six months before separating.

Blue Whale Predators

 The Blue Whale does survive well due to its size. They don’t have any natural enemies except for the Orca. They may become something that the Orca wants but they won’t give in without a fight. In fact, many Blue Whales out there have the scars from their battles with them to prove that they aren’t easy prey at all.

Of course many humans love the thrill of the kill for such a huge animal. This became such a problem that the government had to step in around 1966 and make it against the law to do so. Of course we all know too well that people will continue to break the laws so that isn’t enough.

Due to the illegal hunting by humans as well as global warming and pollution in the ocean, the Blue Whale is an endangered animal. There are an estimated 12,000 out there still remaining. If we all do our part though they will have a bright future and they can start to get their numbers to increase.


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    BBB 4 years ago


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    Solomon 6 years ago


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    Angela Michelle Schultz 7 years ago from United States

    This is a great hub! I linked from my hub on the largest animals, so that way even more people can enjoy it!

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    diahn 8 years ago

    blue whales are so big

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    diahn 8 years ago

    blue whales are so big