Killer Whale (Orca): Facts, Diet & Where to See Them

1. What Is a Killer Whale?

The ocean's top predator, and a very big dolphin

Killer whales are toothed whales and the largest species of oceanic dolphin. They live in every ocean, from the tropics to the pack ice, and sit at the very top of the food chain. Nothing hunts an adult orca.

The name "killer whale" is thought to come from early sailors, who saw them attacking large whales and called them "whale killers". "Orca" comes from the scientific name, Orcinus orca.

• Lifespan: females often live 50+ years; males usually 30 or so
• Social life: tight family groups called pods
• Conservation status: Data Deficient globally, partly because the different types may be separate species

2. Size, Markings & How to Recognize One

Black, white and unmistakable

The tall, triangular dorsal fin of an adult male is visible from far away and is often the first thing you'll spot. Behind the fin is a grey "saddle patch", and each animal has a white eye patch above and behind the eye. The shape and size of that eye patch is one of the main ways to tell Antarctica's orca types apart.

Many Antarctic orcas look yellowish or brownish rather than crisp black and white. That's a film of tiny algae called diatoms, which builds up on their skin in cold water.

3. Antarctica's Killer Whale Types

Same species name, very different lifestyles

Scientists recognize several Antarctic killer whale "ecotypes". They look slightly different, eat different prey and don't appear to mix. Some researchers argue they're separate species.

On a Peninsula cruise, you're most likely to meet Type B orcas. Type C belongs to Ross Sea voyages, and Type D is among the least-seen large animals on the planet.

4. What Killer Whales Eat

It depends entirely on who's asking

As a species, killer whales eat almost anything: fish, squid, penguins, seals and other whales. But each Antarctic type is a specialist, and the diet tells you a lot about where to look.

• Whale hunters (Type A): chase and tire out minke whales in open water
• Seal hunters (large Type B): target Weddell seals and other seals resting on floes. See our guide to Antarctica's seals.
• Penguin and fish eaters (small Type B): patrol the channels near penguin colonies
• Fish eaters (Types C and D): hunt Antarctic toothfish in the ice and deep water

Orcas are one of the few animals that prey on leopard seals, Antarctica's other top predator.

5. How They Hunt

Wave-washing, teamwork and patience

The most famous Antarctic hunting technique is "wave-washing". A group of pack-ice orcas spots a seal on a small ice floe. They line up, swim at the floe side by side and dive together at the last moment. The wave they create tips the floe or washes the seal into the water.

It's a learned skill, passed from older whales to younger ones, and it can take several tries. Pods have also been seen breaking floes apart before a wave attack.

• Spyhopping: orcas rise vertically to look across the ice for seals
• Cooperative hunting: the whole pod coordinates, often with calves watching
• Sharing: food is frequently shared within the family group

6. Family Life

Pods built around mothers

Killer whales live in stable family groups, usually led by an older female. Pods in Antarctica are often from a few animals up to around 20, and several pods sometimes travel together.

Calves are born after a pregnancy of about 17 months and stay with their mothers for years. Much of what an orca knows, including hunting techniques and calls, is learned from its family. That's why each ecotype keeps its own traditions.

Research in Antarctica has also found that some types travel north to warmer subtropical waters for short trips, likely to shed and regrow skin without losing body heat in the cold.

7. Where to See Killer Whales

Anywhere, any time, if you're lucky

Orcas range widely and don't follow a timetable, so there's no guaranteed spot. These are the places where the odds are best:

• The Gerlache Strait: home ground of the small Type B "Gerlache" orcas, seen on many Peninsula voyages
• The Lemaire Channel and Paradise Harbour: narrow waters where pods sometimes pass close
• The Weddell Sea pack ice: the best area for seal-hunting Type B pods
• The Ross Sea: home of Type C orcas, on specialist long-range voyages
• The Drake Passage and South Georgia: occasional sightings at sea

Ships usually announce whale sightings over the PA system. Keep a warm layer and your camera near the cabin door.

8. Watching Orcas Well

Quiet engines, steady distance

Orcas are fast, and a sighting may last minutes or an hour. Under IAATO guidelines, ships and Zodiacs slow down, avoid cutting across a pod's path and don't separate mothers and calves.

• Scan for the fin: an adult male's dorsal fin is visible long before the body
• Watch the floes: seals hauled out on small floes can draw hunting pods
• Use a telephoto: 100–400mm works well from deck. See our Antarctica camera gear guide.
• Share your photos: researchers use dorsal fin and eye-patch photos to identify individuals