---
title: "Southern Elephant Seal Facts, Dives and Big Nose"
description: "Learn why male southern elephant seals have inflatable noses, how these giant seals dive and where they breed around the Southern Ocean."
canonical: "https://uglyanimals.net/animals/elephant-seal/"
locale: "en"
content_type: "animal_profile"
primary_entity: "Southern elephant seal"
scientific_name: "Mirounga leonina"
---

# Southern elephant seal: facts, deep dives and the male's big nose

The southern elephant seal is the largest seal and one of the deepest-diving mammals. Adult males combine immense size with an inflatable proboscis that strengthens calls during crowded breeding contests.

## Quick facts

- **Scientific name:** Mirounga leonina
- **Animal type:** True seal and marine mammal
- **Range:** Southern Ocean and sub-Antarctic breeding islands
- **Diet:** Fish and squid caught during deep ocean dives
- **Male mass:** Up to about 3,000 kilograms in Australian records
- **Distinctive feature:** Inflatable male proboscis
- **Global status:** Least Concern

## What is a southern elephant seal?

Southern elephant seals are true seals, meaning they lack external ear flaps and cannot rotate their hind flippers forward to walk. They look cumbersome on a beach but become efficient, streamlined swimmers in the ocean.

Males are several times heavier than females. This extreme size difference reflects competition at breeding colonies, where dominant bulls attempt to control access to groups of females.

## What does the elephant seal's nose do?

The proboscis develops in adult males and can be inflated during displays. It helps resonate the low roaring calls used in confrontations and gives the species its elephant-like common name.

The nose does not function as a grasping trunk. It is primarily a sound and display structure attached to a face that must also close tightly for long, high-pressure dives.

## How can southern elephant seals dive so deep?

Large blood volume, abundant haemoglobin and oxygen-storing myoglobin allow the seal to carry substantial oxygen reserves. A streamlined body and controlled heart rate help use those reserves efficiently.

Recorded dives can exceed 1,500 metres and approach two hours, although typical dives are shorter and shallower. Seals spend only brief intervals breathing at the surface before descending again.

## Where do southern elephant seals breed?

They breed and moult on sub-Antarctic islands and a few temperate coasts, then travel thousands of kilometres through the Southern Ocean to feed. Males and females often use different foraging zones.

Commercial sealing nearly eliminated some populations for oil. Protection allowed recovery, but regional trends differ and food availability, disease and ocean change can affect survival.

## Conservation status: Least Concern

The global population is assessed as Least Concern and many colonies recovered after sealing ended. Regional declines, food availability and emerging disease still require long-term monitoring across widely separated breeding populations.

## Related animals

- [Proboscis monkey](https://uglyanimals.net/animals/proboscis-monkey/)
- [Saiga antelope](https://uglyanimals.net/animals/saiga-antelope/)
- [Naked mole-rat](https://uglyanimals.net/animals/naked-mole-rat/)

[See more mammals](https://uglyanimals.net/animals/mammals/)

## Related habitats and adaptations

- **Habitat:** [Coasts and islands](https://uglyanimals.net/habitats/coasts-islands/)
- **Adaptation:** [Noses and faces](https://uglyanimals.net/adaptations/noses-faces/)
- **Adaptation:** [Senses and signals](https://uglyanimals.net/adaptations/senses-signals/)

## Sources

- [Australian Antarctic Program: Elephant Seal](https://www.antarctica.gov.au/about-antarctica/animals/seals/elephant-seal/): Diving physiology, breeding, diet, distribution and status.
- [Tasmanian Department of Natural Resources: Southern Elephant Seal](https://nre.tas.gov.au/wildlife-management/fauna-of-tasmania/mammals/seals/southern-elephant-seal): Body size and the acoustic function of the male proboscis.