10 Incredible Leopard Seal Facts

Written by Niccoy Walker
Published: June 29, 2022
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Leopard seals, or sea leopards, are fierce predators with formidable hunting skills. These seals are the only one of their kind that feeds on warm-blooded animals, including other seals. With a thick layer of blubber, these earless seals spend their lives in Antarctic or sub-Antarctic waters. 

We’ve combed through fascinating details about these creatures and compiled a list of 10 incredible leopard seal facts.

1. Leopard seals are bigger than you think

Leopard Seal going to the water10 incredible leopard seal facts
Female leopard seals can reach up to 12 feet and over 1000 pounds.

cyfer13 / Creative Commons

Leopard seals are enormous, powerful predators, with females being bigger. When you think of seals, you may think about adorable puppy-like creatures at the zoo. Sea leopards are not that. While they may keep a slight grin on their face, they are anything but cute and friendly. 

Female leopard seals can reach up to 12 feet and over 1,000 pounds. The largest ever witnessed was over 1,300 pounds and almost 13 feet. Their heads are the size of a grizzly bear’s, and their mouths are full of long, sharp teeth.

2. Leopard seals are one of the most deadly mammals in the Antarctic

Leopard seals are giant apex predators that roam Antarctic waters. It is the second-largest seal in the Antarctic ecosystem, behind elephant seals. Unlike their chubby cousins, leopard seals have long, muscular bodies and exceptionally powerful jaws filled with serrated teeth. 

Their jaws can open to 160 degrees and clamp down with incredible force. These bite-and-tear eaters easily rip penguins and baby seals to shreds by jerking their heads from side to side.

3. A leopard seal killed a scientist

Scientists have been diving and snorkeling in Antarctica for decades without any casualties from leopard seals. But that changed in July 2003 during a snorkeling trip on the Antarctic Peninsula. 

Kirsty Brown, a British marine biologist, was struck by a leopard seal, pulled underwater, and held there for several minutes. Despite rescue and resuscitation efforts, Kirsty passed away. 

It is unknown why the seal attacked her, but researchers believe it could be due to increased human presence around these creatures. Scientists worry this incident could lead to more life-threatening encounters.

4. Footage shows they have a hospitable side

Most Vicious Animals10 incredible leopard seal facts
A leopard seal tried to feed penguins to a scientist.

While trying to capture a realistic view of the leopard seal and redeem them from their mean stereotype, a scientist recorded a glimpse inside their mysterious personalities. After a few minutes of posturing in front of the man, the female seal relaxed and started trying to feed him penguins. 

She threw live penguins in his direction so he could catch them. When that didn’t work, she resorted to offering him dead penguins. Finally, in a fit of exasperation, she plopped the penguins right on top of his head. 
Most stories you read about leopard seals involve violence and aggression, but this video proved that there is still much we don’t understand about this animal.

5. Leopard seals feed on sharks in New Zealand

We know that leopard seals prey on penguins and other seals, but for the first time, there is evidence that they also prey on sharks. In 2021, scientists led a study to understand these predators better. The team studied and analyzed copious amounts of leopard seal scat and made the astonishing discovery of shark remains. 

New Zealanders see more and more leopard seals these days, and researchers believe it could be because they are looking for more food options due to climate warming. It is unknown if these seals have always hunted sharks or if this is a new behavior. Nevertheless, predators feasting on predators is concerning and a possible disruption in the fragile ecosystem.

6. Leopard seals steal from each other

Scientists have always speculated that leopard seals engage in cooperative hunting, where they willingly pass food back and forth. But new evidence suggests that leopard seals are, in fact, big bullies. 

A National Geographic team attached cameras to several of these seals and witnessed them outright steal food from each other. This thievery does not end peacefully. The two will strike each other with their powerful jaws until one releases its grip. Unfortunately, it is usually the smaller one that goes without a meal. 

Food stealing (kleptoparasitism) is not unknown in the animal kingdom, but it is very rare amongst marine mammals.

7. These apex predators enjoy singing underwater

Leopard Seal lying on rocks
Leopard seals produce song-like calls during mating season.

B.navez / Creative Commons

While they may not sing in the way accustomed to humans, leopard seals use vocalizations for many purposes. Male and female seals produce song-like calls during mating season, but the males are the loudest and most committed. 

They will often make “trills” and “hoots” all night, every night. These broadcast calls help them locate and select a mate. Seals share common sounds, but each combines them into unique sequences. Male leopard seals also sound different based on their age.

8. Leopard seals like to play with their food

Leopard seals are the bullies of the Antarctic, and they enjoy playing with and taunting their prey. When a leopard seal has eaten its fill for the day, it will often play a cat-and-mouse game with frightened penguins.

The seal will chase the penguin back and forth from the shore until it finally lets it return to safety. There is no other point to this charade other than the seal finds great enjoyment from the game. Researchers speculate it may also be a way to train young leopard seals in hunting.

9. The gestation period for a leopard seal is 11 months

Leopard Seal lying on ice
Mother leopard seals are pregnant for 240 days.

Gilad Rom / Creative Commons

When a female leopard seal reaches two to six years old, she is ready to start breeding. After mating with a bull, this female seal species undergo a process called delayed implantation. Delayed implantation ensures that the pup won’t be born until the summer by delaying the fertilization of the egg for three months. The mother is pregnant for around 240 days.

To give birth, the mother seal eats more food than usual and then hauls herself onto the ice. A pup seal will have to fend for itself only a few weeks after birth.

10. Leopard seals only have one natural predator

Orcas (killer whales) are the only known predators of leopard seals. Orcas are giant, aggressive animals that prey on these seals. Leopard seals are not known for having a long life span, but if they manage to evade a killer whale, they can live for up to 26 years.

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About the Author

Niccoy is a freelance writer and content creator, experienced in topics like nature, animals, travel, and food. She lives in the foothills of the Rocky Mountains and enjoys hiking, reading, and cooking!