The leopard seal (Hydrurga leptonyx) is one of Antarctica’s iconic apex predators. Named for its spotted, leopard‑like patterning, it is closely tied to sea‑ice habitats, where it hauls out to rest, moult, and breed and patrols ice edges to hunt.
Leopard seals are often solitary and highly adaptable hunters. Their diet can range from krill and fish to penguins and other seals, making them influential in Southern Ocean food webs.
Taxonomy
Leopard seals are true seals (family Phocidae) in the genus Hydrurga.
Appearance
They have a streamlined body, large head and powerful jaws. Colouration is typically dark to silvery grey with a paler underside and irregular dark spots. Long canines and complex teeth allow them to grip larger prey and sieve smaller prey like krill. Females are generally larger than males.
Range and habitat
The species is circumpolar around Antarctica and the sub‑Antarctic, strongly associated with pack ice and ice edges. It also uses coastal shelf waters and areas near penguin colonies. Vagrant individuals sometimes appear at lower latitudes such as New Zealand or southern Australia.
Behaviour
Often solitary, they haul out on drifting ice floes and hunt with speed and agility in the water. During the breeding season, males produce underwater vocalisations linked to mating behaviour.
Diet
Diet is broad and variable: krill, fish and squid are common, while adults may also prey on penguins and other seals and may scavenge whale carcasses.
Reproduction and life history
Females usually produce a single pup. Newborns are roughly 1.0–1.6 m long and weigh about 30–35 kg. Sexual maturity is thought to be around four years. Longevity is estimated at 26+ years, with some records approaching 30 years in the wild.
Conservation status and threats
The IUCN Red List assesses the leopard seal as Least Concern (LC; assessed 2015). Potential pressures include climate‑driven sea‑ice loss, indirect effects from fisheries (including krill fisheries), marine debris and entanglement, pollutants, and local disturbance from shipping and tourism.
