Blue Whale
Blue Whale Facts
| Size | 98-108 feet (30-33 m) |
| Speed | Up to 18 mph (30 km/h) |
| Weight | 180-200 tons |
| Lifespan | 80-90 years |
| Food | Plankton, krill, small fish |
| Predators | Orcas |
| Habitat | Global oceans |
| Order | Whales |
| Order | Baleen Whales |
| Family | Rorquals |
| Scientific name | Balaenoptera musculus |
| Characteristics | Largest animal in the world |
Main Characteristics
The blue whale is the largest and heaviest animal on Earth. It possesses the biggest eyes, the largest lungs, the biggest heart, and the heaviest tongue. It belongs to the baleen whale family, which includes the humpback whale, fin whale, gray whale, North and South right whales, Greenland whale, and dwarf whale. Its diet mainly consists of krill and plankton. Despite its name, the blue whale is not actually blue; it has a gray to bluish-gray skin color.
Records
The blue whale has set an impressive array of records. Its lungs are so large that it could inflate 2,000 balloons with a single breath. Its tongue is so massive that 50 people could stand on it. When diving, it can significantly reduce its heart rate, beating only 2-8 times per minute, compared to a human's 60-80 beats per minute. Here is the complete list:
- Largest lungs: 1,320 gallons (5,000 liters)
- Largest eyes of a vertebrate: 4.29 inches (10.9 cm)
- Largest heart: 440 pounds (200 kg)
- Heaviest tongue: 4 tons
- Largest tail fin: 20-24 feet (6-7.5 meters)
- Highest blow: 20-30 feet (6-9 meters)
- Slowest heart rate: 2-8 beats per minute
- Highest food intake: 4-7 tons daily
- Greatest size difference between predator/prey
- Largest migrator
Distribution and Habitat
Blue whales inhabit all the world's oceans. They rarely come close to shore, preferring the open sea where they can find ample food.
Way of Life
Blue whales are primarily solitary creatures. They come together to mate or occasionally meet when they are foraging in areas rich in plankton.
Anatomy and Appearance
Baleen Plates
Instead of teeth, the blue whale has 300-400 thin, black horn plates in its upper jaw. They are called baleen. It doesn’t use them for cutting or chewing, but for filtering water. For this purpose, the baleen has feather-like fibers. They work like a sieve, allowing water to pass through but not the krill or plankton. The baleen can be about 20-40 inches (50-100 cm) long.
Fins
Everything about the blue whale is large, except for its dorsal fin. It’s is only about 13-18 inches (33-45 cm) tall. In contrast, an orca’s fin can reach up to 6 feet (1.8 meters)! The tail fin, also known as the fluke, has a distinctive notch in the middle and can be 20-24 feet (6-7.5 meters) wide. The pectoral fins, also called flippers, are very narrow and long.
Heart
The heart of a blue whale weighs between 396-440 pounds (180-200 kg) and pumps 53-66 gallons (200-250 liters) of blood with each beat. When diving, it beats only 2-8 times per minute. On the surface, it beats faster again, reaching up to 37 times per minute.
Tongue
A blue whale's tongue can weigh as much as 4 tons – equivalent to the weight of an elephant. It uses its tongue to catch food.
Eyes
Blue whales have the largest eyes of any vertebrate, but relative to their body size, they are quite small. They measure only 4.2 inches (10.9 cm) in diameter – about the size of a grapefruit. In comparison, human eyes are approximately 0.9 inches (2.3 cm) in size.
Size and Weight
Size
Blue whales can reach lengths of 98-108 feet (30-33 meters), making them the longest animals on the planet. To put it in perspective: a blue whale is as long as 17 people who are each 1.80 meters tall.
Weight
A blue whale can weigh 180-200 tons. It's hard to visualize that. So here are a few comparisons: A blue whale weighs as much as six large Brontosauruses, 30-33 large African elephants, 225-250 cows, or 2,860 humans. Just its tongue weighs as much as a Asian elephant. The heart of an adult blue whale is about the size of a golf cart.
Blue Whale or Dinosaur - Which One Is Bigger and Heavier?
Blue whales are heavier than the largest dinosaurs that ever lived - but they are not longer. The Supersaurus could grow up to 137 feet (42 meters) long, but it was nowhere near as heavy. It weighed only 35-40 tons, which is just a fifth of a blue whale. The Argentinosaurus wasn’t larger either. It could reach lengths of up to 114 feet (35 meters), but weighed only 60-80 tons, which is not even half of a blue whale.
Diet
Blue whales are carnivores. Their primary diet consists of plankton. Plankton refers to the collective of tiny organisms that live in the water. They cannot control their swimming direction and simply drift along. A single plankton organism is called a plankter. Additionally, blue whales consume small shrimp-like crustaceans known as krill, which measure only 0.4-08. inches (1-2 cm) in length. On a daily basis, blue whales eat between 4 to 7 tons of plankton, krill, and small fish.
Behavior
Hunting Technique
Blue whales search the ocean for large, dense swarms of krill and plankton, allowing them to consume a significant amount of food in a short time. They swim rapidly towards a swarm and open their mouths wide to capture it. Afterward, they close their mouths and push the water out through their baleen plates. The swarm remains in their mouths and can be swallowed.
Migration
Depending on the season, blue whales migrate to warmer or colder waters. In the warmer, subtropical seas, they gather for breeding. They primarily find food in colder oceans, such as the Arctic Ocean and the Southern Ocean.
Do Blue Whales Jump?
Given their size and weight, one might think that blue whales cannot leap out of the water. In reality, they do so very rarely, as it requires a lot of energy. Typically, it is the males that jump during mating season to impress a female.
Are Blue Whales Dangerous?
Blue whales are not aggressive; they are peaceful and calm. However, they can pose a danger to humans due to their size and weight. For instance, if a person swims next to a blue whale or is in a small boat, they could accidentally be injured by a fin slap. A blue whale cannot eat a human: it lacks teeth for chewing, and its esophagus is not wide enough for a person to pass through.
Abilities and Senses
Senses
Blue whales have the largest eyes of any vertebrate, but their eyesight isn't particularly well developed. They don't rely on it much, as they primarily depend on their sense of hearing. It is said that they can hear up to 1,000 miles (1,600 km) away.
Song
Blue whales don't sing as melodically as humpback whales. However, their songs are particularly deep, which is quite fascinating. The frequency (or pitch) ranges from 15 to 20 Hertz. With our human hearing, we can just barely perceive it. No other animal produces such low sounds, except for elephants. By the way, deep doesn't mean quiet! The sounds can reach up to 188 decibels, which is louder than a jet plane. Since water transmits sound very well, they can still be heard from 500 miles (800 km) away.
Diving
The food of blue whales usually stays no deeper than 330 feet (100 meters) below the water's surface. Therefore, blue whales don't dive particularly deep. The greatest depth ever recorded was 1,033 feet (315 meters).
Breathing
Blue whales typically surface every two minutes to breathe. Sometimes they can hold their breath for between three and ten minutes, and in rare cases, up to 15 minutes. When these animals dive, their heart rate slows down, allowing them to stay underwater longer.
Heart Rate
When blue whales dive, their heart rate drops to just 2-8 beats per minute. In contrast, a human's heart rate while comfortably sitting on the sofa is around 60-80 beats. Even when a blue whale exerts itself physically, its heart only beats up to 37 times a minute. For us humans, during physical exertion, the heart rate can rise significantly above 100 beats per minute.
Enemies and Threats
Natural Enemies
Blue whales have very few natural predators. Sick, injured, or young individuals may occasionally fall prey to orcas or large sharks.
Human Impact
The greatest threat comes from humans.
Hunting
In the mid-19th century, the harpoon gun was invented. This was bad news for blue whales. By the first half of the 20th century, whalers had killed over 350,000 of these magnificent creatures. In 1966, they were placed under special protection – but the Soviet Union continued to hunt them illegally until around 1970. Why was that? They were considered an important food source back then.
Shipping Traffic
• Noise
Currently, shipping traffic poses one of the biggest threats. The noise from ships not only disrupts communication among the animals but also causes them stress. The stress is so intense that it can lead to illness and hinder reproduction. It’s no surprise: you would go crazy too if someone blasted techno or heavy metal at full volume day and night.
• Vessel Strikes
Blue whales also collide with ships, often resulting in fatal injuries. If you want to help blue whales, here’s a simple tip: shop locally, whether for food or goods. This way, fewer ships need to operate. Feel free to spread the word! :)
Environmental Pollution
Heavy metals like mercury, along with pesticides and microplastics in water, cause inflammation and pathological changes in the hearts, lungs, livers, and kidneys of animals. The reproductive organs also suffer, leading to miscarriages.
Conservation Status
Blue whales are protected under the Washington Convention on International Trade in Endangered Species and can no longer be hunted. According to an estimate by the IUCN in 2018, there are only 5,000 to 15,000 individuals left (as of July 2025). The blue whale is classified as "endangered". However, it may soon be considered "critically endangered".
Reproduction
Blue whales mate in the winter when they are in warmer seas. After a gestation period of 11 months, a baby is born, referred to as a calf. At birth, it already weighs two tons, which is as heavy as two small cars. The calf is nursed for 6-7 months until it reaches over 40 feet (12 meters) in length, at which point it can fend for itself.
Fun Facts
The blue whale is the largest animal, but not the longest. The longest is a slender ribbon worm, which can grow up to 180 feet (55 meters) long.
Animals in the Same Biome:
- Albatross
- Arctic Tern
- Atlantic Puffin
- Fin Whale
- Jellyfish
- King Penguin
- Krill
- Octopus
- Petrel
- Plankton
- Seagull
- Seal
- Sea Lion
- Sea Otter
- Sharks
- Sperm Whale
- Squid
- Loggerhead Sea Turtle
Sources:
- „Largest Lungs“ (https://www.guinnessworldrecords.com)
- „Largest eyes on a living vertebrate“ (https://www.guinnessworldrecords.com)
- „Slowest heartbeat in a mammal“ (https://www.guinnessworldrecords.com)
- „Largest heart“ (https://www.guinnessworldrecords.com)
- „Heaviest tongue“ (https://www.guinnessworldrecords.com)
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