# Leopard Seal (*Hydrurga leptonyx*)

> The leopard seal is a large, solitary predator of the Antarctic pack ice, named for the dark spots scattered across its silvery-grey coat. It grows to about 3.5 m (11.5 ft) long and weighs 200 to 450 kg (440 to 990 lb), with females larger than males. A formidable hunter, it eats penguins, seals, fish and krill and can reach 40 km/h (25 mph) in the water. Wild leopard seals live 20 to 26 years and are listed as Least Concern.

- **Category:** Mammal
- **Conservation status (IUCN):** Least Concern
- **Range:** Antarctic pack ice and sub-Antarctic islands — circumpolar Southern Ocean with vagrant records to Australia and South America.
- **Canonical page:** https://globalanimalguide.org/animals/leopard-seal/
- **Last reviewed:** 2026-07-16

## Scientific classification

- **Kingdom:** Animalia
- **Phylum:** Chordata
- **Class:** Mammalia
- **Order:** Carnivora
- **Family:** Phocidae
- **Genus:** Hydrurga

## Facts at a glance

| Attribute | Value |
| --- | --- |
| Scientific name | Hydrurga leptonyx |
| Diet | Carnivore — penguins, seals, fish, and krill |
| Habitat | Antarctic and sub-Antarctic pack ice and waters |
| Lifespan | 20–26 years in the wild |
| Weight | 200–450 kg (440–990 lb); females larger |
| Top speed | Up to 40 km/h (25 mph) in water |
| Conservation status | Least Concern (IUCN) |

## Antarctica's apex predator

The leopard seal sits near the top of the Antarctic food chain, with only the killer whale as a serious rival. It is one of the very few seals that regularly hunts other warm-blooded animals, including penguins and smaller seals. Armed with a wide gape, powerful jaws and long canine teeth, it is a bold and effective ambush predator. Its reputation is fearsome, yet it plays a central role in keeping Antarctic prey populations in balance.

## A surprisingly varied diet

Despite its predatory image, the leopard seal is a flexible feeder that takes penguins, seals, fish and krill. Much of its diet, especially in summer, is actually made up of tiny shrimp-like krill, which it strains from the water using specially shaped cheek teeth. When hunting penguins, it often waits at the ice edge and seizes them as they enter the sea, then thrashes the catch to break it apart. This mix of hunting and filter-feeding lets it thrive across the changing Antarctic seasons.

## Built for cold water

The leopard seal is superbly adapted to the freezing Southern Ocean. A thick layer of blubber insulates its long, muscular body and streamlines it for fast, agile swimming. Unusually for a seal, it relies mainly on its powerful front flippers to drive itself through the water, giving it bursts of speed up to 40 km/h. Its large head and serpentine neck let it strike quickly at fast-moving prey.

## A solitary life on the ice

Leopard seals live alone across a vast range of Antarctic and sub-Antarctic pack ice and water. Outside the brief breeding season they rarely tolerate company, hauling out on isolated ice floes to rest between hunts. They communicate over long distances with haunting underwater calls, which males produce for hours during the summer. This solitary, wide-ranging lifestyle makes the species difficult to study in the wild.

## Breeding and life cycle

Mating takes place in the water during the Antarctic summer, and females give birth on the ice after a gestation of around eleven months. A mother nurses her single pup on rich milk for about a month before leaving it to fend for itself. Females grow larger than males, reaching lengths of around 3.5 m, and both sexes can live for 20 to 26 years in the wild. Young seals must learn to hunt quickly once their mother departs.

## Conservation status

The leopard seal is listed as Least Concern by the IUCN, and its remote Antarctic home has so far shielded it from most direct human pressures. Its numbers are hard to count precisely because the animals are scattered and spend much of their time on remote ice. The greatest long-term concern is climate change, which is reducing the sea ice the seals and their prey depend on. Shrinking krill stocks in a warming ocean could affect the whole Antarctic food web on which the leopard seal sits.

## Frequently asked questions

### How big is a leopard seal?

Leopard seals grow to around 3.5 m (11.5 ft) long and weigh between 200 and 450 kg (440 to 990 lb). Unusually, females are larger than males.

### What do leopard seals eat?

Leopard seals eat penguins, other seals, fish and krill. They are one of the few seals that hunt warm-blooded prey, but a large part of their diet is actually tiny krill strained from the water.

### Are leopard seals dangerous to humans?

Leopard seals are powerful predators and should be treated with respect, and there have been rare serious incidents. Encounters are uncommon, however, because the seals live in remote Antarctic waters far from most people.

### How fast can a leopard seal swim?

A leopard seal can swim at up to 40 km/h (25 mph). It uses its long front flippers, rather than its hind flippers, to power through the water in fast, agile bursts.

### How long do leopard seals live?

Leopard seals live around 20 to 26 years in the wild. Females tend to grow larger than males, and both sexes reach maturity after a few years.

### Are leopard seals endangered?

No. Leopard seals are listed as Least Concern by the IUCN, largely because they live in remote Antarctic waters. The main long-term threat is climate change, which is reducing the sea ice and krill they depend on.

## Sources

- [IUCN Red List — Hydrurga leptonyx.](https://www.iucnredlist.org/search?query=Hydrurga%20leptonyx&searchType=species)
- [Animal Diversity Web — Hydrurga leptonyx. University of Michigan Museum of Zoology.](https://animaldiversity.org/accounts/Hydrurga_leptonyx/)

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Source: Global Animal Guide (https://globalanimalguide.org/animals/leopard-seal/). Licensed CC BY-NC 4.0 — free for non-commercial reuse with attribution.