South American sea lion
Otaria byronia
Curious sea lions may come closer when they choose. Keep space at colonies, never touch or chase, and never treat a sighting as guaranteed.
Least Concern (IUCN, 2016) means it is not at high risk of extinction worldwide today.
Photos show the species, not always the places on this page.
Length
Males usually 2.1 to 2.6 m (6.9 to 8.5 ft); females 1.5 to 2 m (4.9 to 6.6 ft). Argentine sources give up to 2.8 m (9.2 ft) for males
Weight
Males usually 300 to 350 kg (660 to 770 lb); females about 170 kg (375 lb), with Argentine sources giving 120 to 160 kg (265 to 355 lb)
Next to a person
An adult bull can weigh as much as several people together and carries a thick mane. Females are much smaller.
What it eats
An opportunistic hunter of fish, squid, octopus and crustaceans. Its diet changes with place and season.
Around people
Potentially dangerous, respect
How it lives
South American sea lions are very social animals. They gather in big groups on the coast, at resting sites used all year or only in some seasons, and at breeding colonies, where one male breeds with several females. They hunt mainly fish and cephalopods, and their diet changes with place and season.
Where it goes
Not a true migrant. They rest at haul-out sites and gather at breeding colonies; in Argentina breeding starts in mid-December and colonies spread out again around late February. After breeding, males often move between nearby colonies, and some travel hundreds of kilometres along the coast.
We only draw a journey on the map when scientists have tracked it or clearly documented it. For this animal we have not found one yet.
Populations
Lives on South American coasts: on the Pacific from Peru to Cape Horn, and on the Atlantic from southern Brazil to the far south of Argentina and the Falklands. Atlantic and Pacific animals form genetically different groups. Punta Loma, near Puerto Madryn, is Chubut's oldest wildlife reserve (1966) and has a breeding colony. Many South American agencies still use the older name Otaria flavescens.
Meet it respectfully
Watch from the Punta Loma viewpoints with quiet voices and a prudent distance. Snorkelling with sea lions in Golfo Nuevo happens only with authorised local trips, and the sea lions choose to come or not. Never touch, feed, chase, surround or block them, even when young animals come close. Bulls defend their space, so keep well back at colonies. Many avoid January and February, the breeding season.
Fun fact
Tap the bulb to light it up.
Adult males grow a thick mane from the forehead to the shoulders.
Bulls can weigh about twice as much as females.
They usually dive 20 to 65 m, but dives deeper than 170 m have been recorded.
In Spanish, 'lobo marino' can mean this sea lion or a fur seal.
Adult males stay on land for about two months, and they fast the whole time. They eat nothing until they head back out to sea.
Source: Argentina National Parks/SIB, Otaria flavescens species sheet
In the Falkland Islands, tracked females each kept their own feeding style for years. Most made trips of about 92 km offshore, while others stayed about 10 km from the coast.
Source: Baylis et al., 2015, Oecologia, foraging specialisations of southern sea lions
South American sea lion in the Ocean Atlas
Places we have researched where this animal is recorded. It is never guaranteed, and some places are for watching from the boat only.
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Sources for this page
- Argentina National Parks/SIB, 2026
- Argentina.gob.ar
- Chubut Patagonia (provincial tourism), Punta Loma
- La Nación, 2021, snorkelling with sea lions near Puerto Madryn
- IUCN Red List, Cárdenas-Alayza et al., 2016
- WoRMS, 2026
Facts checked 26 September 2026. Photos: Unsplash licence, or Creative Commons as shown on each photo.
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