Behold Livyatan: the sperm whale that killed other whales
Update: This animal has been renamed! It used to be Leviathan until someone pointed out to the authors that the name had already been taken!
In today’s oceans, killer whales hunt other species of whales, working in packs to take down their much bigger prey. But living whales have it easy. Those that swam off the coast of Peru around 12 million years ago were hunted by a far bigger predator, a recently discovered animal with a very appropriate name: Livyatan.
Livyatan melvillei, named after the Biblical sea monster and the author of Moby Dickauthor of Moby Dick, was a giant sperm whale that has just been discovered by Belgian scientist Olivier Lambert. At between 13.5 and 18.5 metres in length, it was no bigger than the modern sperm whale, but it was clearly far more formidable.
Today’s sperm whale has no functional teeth in its upper jaw and only small ones in its lower jaw (which are mostly used in fights). It feeds through suction, relying on a rush of water to carry its prey into its open mouth. But Livyatan’s mouth was full of huge teeth, the largest of which were a foot long and around 4 inches wide. This was no suction feeder! Livyatan clearly grabbed its prey with a powerful bite, inflicting deep wounds and tearing off flesh as killer whales do, but with a skull three times bigger.
Livyatan was at the very top of the food chain and it must have needed a lot of food. While modern sperm whales mainly eat squid, Lambert thinks that Livyatan used its fearsome teeth to kill its own kind – the giant baleen whales. At the same point in prehistory, baleen whales started becoming much bigger and they were certainly the most common large animals in the area that Leviathan lived in. Lambert thinks that the giant predator evolved to take advantage of this rich source of energy. He says, “We think that medium-size baleen whales, rich in fat, would have been very convenient prey for Livyatan .”
It’s perhaps no coincidence that the biggest shark in history – the mighty Megalodon – also appeared at the same time in the same part of the world. It too was thought to have hunted whales and many of its teeth have also been found at Cerro Colorado. For the moment, it’s hard to say if the two predators were direct competitors, since they may have swum in different parts of the Peruvian seas. Lambert speculates that the adults of either species could have eaten the young of the other but there’s no evidence for this yet.
In the last few years, other smaller prehistoric sperm whales have been found in Peru and Italy. Their powerful teeth told us that these predators bit their prey in the manner of killer whales. The teeth were generally quite small but, as early as 1877, fossil hunters have found much larger teeth that looked very much like those of a sperm whale. The teeth provided tantalising hints of a much bigger animal but they were never accompanied by an actual skull. Their owner remained an enigma.
Lambert set out to find that skull in 2006, leading several expeditions into Peru’s Pisco-Ica desert. The digs weren’t fruitful but the team’s luck took a turn for the amazing at the very end. “In November 2008, on the last day of the field trip, my Dutch colleague Klaas Post discovered a very large cetacean skull,” says Lambert. “Usually large skulls belong to baleen whales, but Klaas immediately noted enormous teeth, both on the upper and lower jaw.” They had found Livyatan.
The skull is beautifully adapted to capture large, powerful prey. The snout was short and wide, allowing it to bite more strongly with its front teeth and resist the struggles of its prey. Its temporal fossa – the shallow depression on the side of the skull – was enormous and could old huge jaw-closing muscles. The bite would have been the largest of any tetrapod (the animal group that includes mammals, birds, reptiles and amphibians). And the teeth were deeply embedded in the jaw bones for each support, and interlocked to give the animal a shearing, meat-carving bite. They were also angled forwards, giving Livyatan a better grip on prey with curved bodies.
The skull also creates a mystery. Sperm whales have a unique organ in their heads called the spermaceti, and Livyatan’s was particularly large. The spermaceti is full of a waxy substance that was originally thought to be the animal’s sperm (hence the name). Its purpose isn’t clear although there are many theories, all of which must now be considered in the light of Livyatan’s very different lifestyle.
The sperm whale might use it to control its buoyancy during a dive by pumping in cold water, solidifying the wax and increasing the density of its head. At the depths, the energy expended during a hunt heats up the wax and melts it again. But Livyatan probably didn’t hunt for squid and probably wasn’t a deep-diver like the modern sperm whale. In light of this, other explanations become more intriguing. The case containing the spermaceti could be used as a battering ram during fights. It could also boost the sperm whale’s echolocation, allowing it to stun its prey with sound, or woo females (the male’s organ is particularly big).
More on ancient whales:
- Whales evolved from small aquatic hoofed ancestors
- Sperm whale poo offsets carbon by fertilising the oceans with iron
- Ever since there have been whales, there have been Osedax worms eating their bones
- Scientists, film-makers team up to expose illegal international trade in whale meat
- Echolocation in bats and whales based on same changes to same gene
- Fossil foetus shows that early whales gave birth on land
If the citation link isn’t working, read why here
Livyatan
Go Further
Animals
- Octopuses have a lot of secrets. Can you guess 8 of them?
- Animals
- Feature
Octopuses have a lot of secrets. Can you guess 8 of them? - This biologist and her rescue dog help protect bears in the AndesThis biologist and her rescue dog help protect bears in the Andes
- An octopus invited this writer into her tank—and her secret worldAn octopus invited this writer into her tank—and her secret world
- Peace-loving bonobos are more aggressive than we thoughtPeace-loving bonobos are more aggressive than we thought
Environment
- This ancient society tried to stop El Niño—with child sacrificeThis ancient society tried to stop El Niño—with child sacrifice
- U.S. plans to clean its drinking water. What does that mean?U.S. plans to clean its drinking water. What does that mean?
- Food systems: supporting the triangle of food security, Video Story
- Paid Content
Food systems: supporting the triangle of food security - Will we ever solve the mystery of the Mima mounds?Will we ever solve the mystery of the Mima mounds?
- Are synthetic diamonds really better for the planet?Are synthetic diamonds really better for the planet?
- This year's cherry blossom peak bloom was a warning signThis year's cherry blossom peak bloom was a warning sign
History & Culture
- Strange clues in a Maya temple reveal a fiery political dramaStrange clues in a Maya temple reveal a fiery political drama
- How technology is revealing secrets in these ancient scrollsHow technology is revealing secrets in these ancient scrolls
- Pilgrimages aren’t just spiritual anymore. They’re a workout.Pilgrimages aren’t just spiritual anymore. They’re a workout.
- This ancient society tried to stop El Niño—with child sacrificeThis ancient society tried to stop El Niño—with child sacrifice
- This ancient cure was just revived in a lab. Does it work?This ancient cure was just revived in a lab. Does it work?
- See how ancient Indigenous artists left their markSee how ancient Indigenous artists left their mark
Science
- This 80-foot-long sea monster was the killer whale of its timeThis 80-foot-long sea monster was the killer whale of its time
- Every 80 years, this star appears in the sky—and it’s almost timeEvery 80 years, this star appears in the sky—and it’s almost time
- How do you create your own ‘Blue Zone’? Here are 6 tipsHow do you create your own ‘Blue Zone’? Here are 6 tips
- Why outdoor adventure is important for women as they ageWhy outdoor adventure is important for women as they age
Travel
- Slow-roasted meats and fluffy dumplings in the Czech capitalSlow-roasted meats and fluffy dumplings in the Czech capital
- Want to travel like a local? Sleep in a Mongolian yurt or an Amish farmhouseWant to travel like a local? Sleep in a Mongolian yurt or an Amish farmhouse
- Sharing culinary traditions in the orchard-filled highlands of JordanSharing culinary traditions in the orchard-filled highlands of Jordan