The killer whale and leopard seal are the largest carnivores in the Antarctic ocean; killer whales will feed on other whales and they both feed on other sea mammals like seals, turtles, octopi, and birds.

Animal Diversity Web, Physeteridae (sperm whale) Pictures
Animal Diversity Web, Physeteridae (sperm whale) Pictures University of Michigan Museum of Zoology Click on an image to enlarge.
Antarctic Fox - Day 2: Leopard
Antarctic Fox - Day 2: Leopard, By Rachel and Kevin Fox, Summer of 2008-9, Antarctic Peninsula, Amazing photographs with descriptions and a short video.
Antarctic minke whale
Antarctic minke whale, Wikipedia, Visit the website for the article.
Beluga Whales Dieting & Eating Habits
Beluga Whales Dieting & Eating Habits, SeaWorld Parks, Beluga whales are not picky eater; they feast on a wide variety of bottom-dwelling animals.
Blue Whale Photographs Underwater
Blue Whale Photographs Underwater, Mike Johnson Marine Natural History Photography, Numerous close-up photographs and videos.
Chinstrap Penguin, Wikipedia
Chinstrap Penguin, Wikipedia.org, Visit the website for photos, a video and article.
Colossal Squid Is No Monster, Study Finds
Colossal Squid Is No Monster, Study Finds, By Stuart Fox, May 10, 2010, LiveScience, Being longer than a school bus, what does this colossal squid eat? And are they aggressive? Find out here.
Crabeater Seal - CalPhotos
Crabeater Seal - CalPhotos, Gerald and Buff Corsi, Copyright California Academy of Sciences, Visit the web site for photos; click to enlarge.
Elephant Seals - Australian Antarctic Division
Elephant Seals, Australian Antarctic Division, Government of Australia, There are photographs (click to enlarge), a physical description, and information on its special adaptations, distribution,
Face-Off With a Deadly Predator
Face-Off With a Deadly Predator, NationalGeographic, November 12, 2009, YouTube.com, Video length: 01:48.
Killer Whale - Wikipedia
Killer Whale, Wikipedia.org, Visit the website for an article and photos (click to enlarge).
Killer Whales - Infobook Index
Killer Whales - Infobook Index, SeaWorld.org, "Explore the intriguing information about one of the ocean's most famous species - killer whales."
Killer Whales Antarctica
Killer Whales Antarctica, Posted by bartbeck, YouTube.com, Video length: 06:11.
Killer Whales Diet & Eating Habits
Killer Whales Diet & Eating Habits, SeaWorld Park, This page provides information on what killer whales eat; other pages that you can access using the menu on the left side provide more.
Killer Whales in Antarctic Waters Prefer Weddell Seals Over Other Prey
Killer Whales in Antarctic Waters Prefer Weddell Seals Over Other Prey, Mar. 30, 2011, ScienceDaily, Read how killer whales work together to nab their favorite food.
Killer Whales in Antarctica
Killer Whales in Antarctica, Uploaded by telisha34, May 24, 2010, YouTube.com, Video length: 02:23.
Leopard Seals - Antarctica 2008/09
Leopard Seals - Antarctica 2008/09 Uploaded by polardive, June 07, 2009, YouTube, Video length: 05:33.
Orcas Attack a Crabeater Seal in Antarctica
Orcas Attack a Crabeater Seal in Antarctica, Uploaded by Lindblad Expeditions, National Geographic, July 17, 2007, YouTube.com, Video length: 03:11
Seals & sea lions
Seals & sea lions, Australian Antarctic Division, Government of Australia, Pictures and information sheets on the seal and sea lion specie that live in the Antarctic ocean.
South Georgia Island Fur Seal and Weddel Seal
South Georgia Island Fur Seal and Weddel Seal, TravelImages.com, Visit the web site for photos; click to enlarge.
Sperm Whale Diving
Sperm Whale Diving, Posted by National Geographic, YouTube.com, Video length: 02:18.
Studying Weddell Seal Ecology In Antarctica
Studying Weddell Seal Ecology In Antarctica, Science360 Video, Video length: 05:14.
Weddell seal
Weddell seal, By Omari J. Bayi, Animal Diversity Web, University of Michigan Museum of Zoology, Visit the website for photos (click for enlargement) and to learn about its habitat, lifespan, b
Weddell seals in Antarctica
Weddell seals in Antarctica, BBC Earth, YouTube.com, Video length: 01:58.
Whale Hunting Krill in Antarctica - Planet Earth - BBC wildlife
Whale Hunting Krill in Antarctica, Planet Earth - BBC wildlife, BBCWorldwide, YouTube.com, Video length: 03:51.
Whales
Whales, Australian Antarctic Division, Government of Australia, Pictures and information on the whale species that inhabit the Southern ocean.