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Blue whales are the largest animals known to have ever lived, reaching about 110 feet long and feeding mainly on tiny krill. NOAA Fisheries reports that they inhabit every ocean except the Arctic, and that many populations migrate seasonally, though their movements vary.
Here are 11 facts about Balaenoptera musculus, including what blue whales eat, how they travel, and the threats they face.
11 blue whale facts
1. Blue whales are the largest animals ever known
The blue whale, Balaenoptera musculus, is the largest member of the rorqual family and the largest animal known to have lived on Earth, according to NOAA Fisheries. Rorquals are baleen whales with pleated throats that let them take in large volumes of water while feeding.
Blue whales are larger than any other known animal, though comparisons with incomplete fossils can be difficult. Their size is especially striking because they feed mostly on small crustaceans rather than large prey.
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2. The largest blue whales can reach about 110 feet long
The largest individuals can reach about 110 feet and weigh up to 330,000 pounds. Antarctic blue whales tend to be larger than those in the North Atlantic and North Pacific, where individuals generally reach about 90 feet and weigh more than 100,000 pounds, according to NOAA Fisheries.
Females are generally larger than males, a pattern common among baleen whales.
3. Blue whales filter-feed on krill
Blue whales eat mostly krill—small, shrimp-like marine crustaceans. Fish and copepods may occasionally supplement their diet, according to NOAA Fisheries.
They do not have teeth. Instead, rows of baleen plates hang from the roof of the mouth and strain krill from seawater.
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4. A large blue whale may eat up to six tons of krill in one day
The biggest blue whales may consume up to six tons of krill in a day, according to NOAA Fisheries. To feed, a whale lunges into a dense swarm with its mouth open.
Its throat pleats expand to hold water and krill. The whale then forces the water back out through its baleen, leaving prey behind.
5. Blue whales live in every ocean except the Arctic
Blue whales occur in every ocean except the Arctic Ocean. Their distribution generally follows areas where krill are concentrated, although some populations’ movements remain poorly understood, according to NOAA Fisheries.
6. Many blue whales migrate seasonally
Many blue whales feed in polar waters during summer and travel toward lower-latitude waters in winter. This is not a rule for every whale: migration varies among populations, and some individuals may not migrate every year, according to NOAA Fisheries.
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7. Their calls may travel up to 1,000 miles
Blue whales are among the loudest animals on Earth. Their low-frequency pulses, groans, and moans may be detectable by other whales as far as 1,000 miles away under favorable ocean conditions, according to NOAA Fisheries.
That distance is an estimate, not a guaranteed communication range; conditions in the ocean affect how far sound travels.
8. Blue whales usually move slowly, but can sprint
Blue whales typically travel at about five miles per hour but can exceed 20 miles per hour in short bursts, according to NOAA Fisheries.
They are more often seen alone or in pairs than in large groups.
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9. Blue whales can live for 80 to 90 years
Blue whales typically live about 80 to 90 years. Researchers estimate their age by counting layers in wax-like earplugs recovered from deceased whales, according to NOAA Fisheries.
10. Blue whale calves develop before birth for about a year
Gestation lasts approximately 10 to 12 months. Calves are probably weaned at about six to seven months, and females generally produce a calf every two to three years, according to NOAA Fisheries.
11. Blue whales are still endangered
Blue whales remain endangered under the U.S. Endangered Species Act and protected under the Marine Mammal Protection Act. Their main current threats include vessel strikes, fishing-gear entanglement, and ocean noise, according to NOAA Fisheries.
Because blue whales reproduce slowly, preventing avoidable losses and protecting their habitat matters to their recovery.
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Why blue whale facts matter
Blue whales show that enormous body size does not require large prey. They depend on krill, healthy ocean food webs, and safe routes through heavily traveled waters. Understanding their behavior helps researchers identify places and activities that may affect them.
FAQ
Are blue whales bigger than dinosaurs?
Blue whales are the largest animals known to have ever lived. They are larger than any animal species identified from the fossil record, though exact comparisons with some incomplete fossils can be difficult.
What do blue whales eat?
They eat mostly krill, filtering it from seawater through baleen plates. Fish and copepods may occasionally supplement their diet.
How long can a blue whale live?
Blue whales typically live about 80 to 90 years. Researchers estimate age by counting layers in wax-like earplugs from deceased whales.
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Are blue whales endangered?
Yes. They remain endangered under the U.S. Endangered Species Act. NOAA Fisheries identifies vessel strikes, fishing-gear entanglement, and ocean noise among their main current threats.
The Bottom Line
Blue whales combine record-breaking size with a specialized lifestyle: they filter-feed on krill, move through most of the world’s oceans, and reproduce slowly. NOAA Fisheries says they remain endangered, with vessel strikes, fishing-gear entanglement, and ocean noise among the main threats.
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