Orcas are apex predators with a diverse diet; different populations specialize on prey including bony fish, sharks, rays, and marine mammals such as seals, dolphins, and whales.

Are orcas social animals?

Yes; orcas are highly social and some populations form stable matrilineal family groups (pods) with group-specific hunting and vocal traditions.

Are orcas dangerous to humans?

Orcas rarely pose a threat to humans and no fatal attack has been recorded in the wild, though captive orcas have injured or killed handlers in marine parks.

Why are some orca populations threatened?

Local populations face threats including prey depletion, habitat loss, pollution by PCBs, captures for marine parks, and conflicts with fisheries.

Do orcas occur everywhere?

Orcas are cosmopolitan and occur from polar to tropical seas but are more commonly documented in temperate or cooler coastal waters.

Are there different types of orcas?

Scientists have proposed dividing the global population into races, subspecies, or possibly even species, and the most studied groups include resident, transient, and offshore types off western North America.

two black and white orca swimming in a body of water

WhalesData Deficient

Killer Whale (Orca)

Q: What is the conservation status of orcas?

The IUCN lists the orca as Data Deficient because multiple orca types may represent distinct species; some local populations are threatened or endangered.

Q: Have any orca populations been specially protected?

Yes; for example, the southern resident orcas were added to the U.S. Endangered Species list in late 2005.

Orcinus orca

The orca (killer whale) is a cosmopolitan, toothed whale and the largest member of the oceanic dolphin family, recognizable by black-and-white pigmentation and white eye patches.

Killer whaleOrca

Last Updated Mar 9, 2026 · 2 sources

Photo byStephen Walker

Species Guide

What to know about killer whale (orca)s

A clean field guide focused on habitat, identification, behavior, and conservation context without burying the useful parts.

The orca (Orcinus orca), or killer whale, is a toothed whale and the largest member of the oceanic dolphin family. It is recognizable by its distinct pigmentation: mostly black on top, white on the bottom, and with white eye patches. A cosmopolitan species, orcas inhabit a wide range of marine environments from Arctic to Antarctic regions and tropical seas, and are more commonly documented in temperate or cooler coastal waters. Scientists have proposed dividing the global population into races, subspecies, or possibly even separate species. Orcas are apex predators with a diverse diet; individual populations often specialize on particular prey types. They are highly social, with some populations forming stable matrilineal family groups (pods). Orcas employ sophisticated hunting techniques and vocal behaviors that can be unique to specific groups and passed down through generations—traits considered manifestations of animal culture.

The global assessment is Data Deficient because multiple orca types may represent distinct species; some local populations are threatened or endangered due to prey depletion, habitat loss, pollution (PCBs), captures for marine parks, and fisheries conflicts.

Orcas are cosmopolitan, inhabiting a wide range of marine environments from Arctic to Antarctic regions and tropical seas, and are more commonly documented in temperate or cooler coastal waters.

Identification

How to identify killer whale (orca)s

The visual markers divers can use underwater, plus the species most likely to cause confusion.

Key identification markers

Coloration

Distinct black-on-top and white-on-bottom pigmentation with recognizable white eye patches.

Taxonomic placement

A toothed whale and the largest member of the oceanic dolphin family.

Range and Movement

How killer whale (orca)s move through the world

The broad range, seasonal movement, or migratory behavior that shapes where divers encounter this species.

Orcas are cosmopolitan, inhabiting a wide range of marine environments from Arctic to Antarctic regions and tropical seas, and are more commonly documented in temperate or cooler coastal waters.

Diet

What killer whale (orca)s tend to eat

Useful feeding context that often explains habitat, movement, and encounter style.

Orcas are apex predators with a diverse diet; individual populations often specialize on particular prey types, including bony fish, sharks, rays, and marine mammals such as seals, dolphins, and whales.

Conservation

What is happening with Killer Whale (Orca)s

Status, pressure, and protection context grounded in cited sources rather than filler.

Main threats

Prey depletion

Local populations are threatened by reductions in preferred prey species.

Habitat loss

Habitat loss is listed as a threat to some local populations.

Pollution (PCBs)

Pollution, specifically by PCBs, is cited as a threat to some populations.

Captures for marine parks

Captures of orcas for display in marine parks have been a historical and ongoing threat.

Conflicts with fisheries

Conflicts with fisheries are noted as a threat to some local populations.

Protections and controls

Endangered listing (example)

The southern resident orcas were added to the U.S. Endangered Species list in late 2005.

Responsible Encounters

How to dive with killer whale (orca)s

Conservation-minded guidance for divers who want the encounter without adding pressure.

Give killer whale (orca) space, avoid blocking the animal's path, and follow local site and operator rules for wildlife interactions with whales.

Field Notes

Interesting things worth knowing

Useful species context that makes the encounter more meaningful once you are underwater.

Field notes

Cultural transmission

Orcas exhibit hunting techniques and vocal behaviors that can be unique to groups and passed down across generations, considered manifestations of animal culture.

Human relationships

Orcas have been revered by indigenous peoples and historically feared by Western cultures; their public image changed in the 1960s with increased study and display in captivity.

Wild vs captive incidents

No fatal attack has been recorded in the wild, but captive orcas have injured or killed their handlers in marine theme parks.

FAQ

Frequently asked questions

Clear planning and conservation answers written for search visibility and AI retrieval.

Research Sources