The South Polar skua of Antarctica is known as the world's most southerly bird. They generally lay two eggs which hatch in late December - late January after an incubation period of 24 to 34 days.
The average life span of the skua is roughly 11 years, but can be longer in the right environment. Most skuas, however, don't live until the 11 year mark because of their violent, aggressive lifestyles.
Skua find the Antarctic beaches -- where they breed -- to be a natural habitat for them.
The skua bird is sometimes called a scavenger.
1.45 poo
1.45 poo
(Stercorarius maccormicki)
If you are talking about the Antarctic skua, then I think it's the sea lion. If not then I don't know.
Antarctic skua breed on Antarctica's beaches and otherwise live elsewhere. Skua chicks, like all bird chicks, are subject to being preyed upon by any raptor interested in feeding its young.
You may be thinking of a skua, or a seal.
Follow the link, below, to see Cool Antarctica's photos of skuas.
Skua predators include larger seabirds such as gulls and predatory mammals like foxes. However, skua populations are primarily threatened by human activities such as habitat destruction and climate change.
Seabirds in that geography include Skua, Albatross, Tern, Penguin and others.