Leopard SealHydrurga leptonyxWhere and when to see them

The leopard seal is a large Antarctic predator with a long body, powerful jaws and a dark, spotted coat. Females are generally larger than males, an unusual pattern among seals. Although famous for hunting penguins, it also consumes substantial quantities of krill. Its flexible feeding equipment and broad prey range allow it to exploit different parts of the Southern Ocean ecosystem as ice conditions and food availability change.

Size

2.4-3.5 m long

Weight

200-500 kg

Lifespan

20-30 years

Status

Least Concern

Usually solitary outside breeding interactions, leopard seals rest on ice floes between feeding trips. Individuals may patrol penguin colonies, ambush birds near the water's edge or repeatedly use productive feeding areas. During the breeding season, males produce elaborate calls that carry through the water. Females normally give birth to one pup on pack ice and nurse it for about a month before it becomes independent. Leopard seals are known for their formidable hunting strategies, often ambushing prey from beneath ice or water. During the breeding season, acoustic communication through underwater vocalizations plays a significant role in male-female interactions across vast distances.

• Females usually exceed males in both length and mass.
• Its cheek teeth can act as a sieve for krill.
• Males produce patterned breeding-season calls beneath the sea surface.
• The genus name Hydrurga means water worker.

November to March offers the main Antarctic visitor window, when daylight is long and coastal access is more feasible. This is an access season rather than a guarantee of encounters. New Zealand records are irregular, although wandering seals are often reported during cooler months. In Antarctica, the summer months facilitate cruise expeditions, increasing the chance of encountering these elusive predators, though specific sightings are unpredictable. For New Zealand, records are opportunistic and more common during cooler, stormy weather when seals may be displaced northward.

Leopard seals inhabit Antarctic and subantarctic waters, especially the edges of drifting pack ice. They also use coastal ice and occasionally haul out on beaches. Wandering individuals reach temperate shores, including New Zealand, well beyond their principal Antarctic distribution. The species occupies a wide circumpolar range around the Antarctic continent, frequently observed on ice floes, particularly during summer. While typically solitary, they are not strictly territorial and individuals may utilize vast areas of ocean for foraging.

Diet includes Antarctic krill, fish, squid, penguins and other seals, with strong differences among individuals and regions. Interlocking cheek teeth help strain small prey, while the large canine teeth and powerful jaws enable the capture and processing of larger animals. Prey consumed is diverse, ranging from microscopic krill, strained effectively with specialized teeth, to large vertebrates such as other seals, for which their powerful jaws are adapted. They are considered apex predators in their ecosystem, with very few natural predators themselves.

Common name

Leopard Seal

Scientific name

Hydrurga leptonyx

Animal group

Mammals

Size

2.4-3.5 m long

Weight

200-500 kg

Lifespan

20-30 years

Status

Least Concern

Identification

Its elongated reptile-like head, unusually wide gape and spotted grey body distinguish it from the rounder-headed Weddell seal and the paler, narrower-faced crabeater seal. Their distinctive, large head and formidable, almost reptilian appearance are key identifiers, setting them apart from other Antarctic pinnipeds. The dark spots on their grey coat are unique to each individual, similar to a human fingerprint.