Orca
Orcinus orca
Also known as Killer Whale, Spekkhogger
The largest member of the dolphin family and a top predator in every ocean. Orcas are associated with shaping marine food webs from the top down, though their role varies sharply between populations, which differ in diet, calls and hunting behaviour.
As an ocean apex predator, the orca is associated with the balance of marine food webs that ocean productivity and fisheries depend on.
How this species supports living systems
Functions → Services → RecipientsEach row is one complete path through the graph: the orca performs a function, which supports a service, which benefits a recipient. Functions and services are shared nodes — tap one to see every species and system connected to it.
What is weakened, layer by layer, if this is lost. Each step is a node in the graph — the effect propagates downstream toward human relevance.
Identity
Despite the name 'killer whale', the orca is the largest dolphin — a toothed whale, not a baleen whale.
Conservation
Data Deficient means there isn't enough global data for a complete extinction-risk assessment. It does not mean the orca is safe: several well-studied local populations are in serious decline.
Distribution
Orcas live in every ocean, but individual populations tend to specialise in particular regions and prey.
Biology
- Highly social — lives in stable, often matrilineal pods
- Population-specific vocal dialects
- Cooperative, sometimes culturally transmitted hunting techniques
- Distinct ecotypes with different diets and behaviour
Different orca populations behave almost like distinct cultures — separate diets, calls and hunting methods passed down within the group. Some eat only fish; others specialise in marine mammals.
Ecological Intelligence
As an ocean apex predator, the orca's hunting is associated with regulating populations of prey such as seals and fish, which is linked to the balance of marine ecosystems.
Threats & Solutions
Threat → Category → DriverFish-eating populations are closely tied to prey such as Chinook salmon; declines in prey are linked to poor body condition and low calf survival.
As long-lived top predators, orcas accumulate persistent pollutants such as PCBs, which are associated with reproductive and immune harm.
Underwater noise can interfere with the echolocation and communication orcas rely on to hunt.
Vessel traffic can disrupt feeding and movement, particularly near coastal populations.
Entanglement and competition with fisheries affect some populations.
Warming and shifting prey distributions are associated with longer-term changes for some populations.
Historic live capture damaged some populations; pressure has declined but persists in places.
Rebuilding the fish and prey populations predators rely on.
Rebuilding key prey stocks such as salmon is central for fish-eating populations.
Phasing out and cleaning up harmful chemicals.
Reducing persistent chemicals lowers the toxic burden carried by top predators.
Ocean zones where harmful activity is limited or banned.
Protected ocean zones can shield critical feeding and resting habitat.
Rules on where and how fast boats can travel.
Speed and approach limits reduce disturbance and noise.
Managing fishing to cut bycatch and protect prey.
Managing fisheries reduces both bycatch and prey competition.
Tracking populations so gaps in data can be closed and trends caught early.
Closing the data gaps behind the Data Deficient status is itself a priority.
Quieter ship technology and traffic management.
Quieter vessels help protect communication and hunting.
Ending the capture and display of wild animals.
Ending live capture removes a historic source of decline.
Importance Assessment
How much this species shapes its ecosystem.
How close the species is to disappearing.
Its significance to people and cultures.
How widely known the species is.
How much reliable data exists.
How relevant it is to 4PLANET missions.
The global orca population is estimated at at least ~50,000 individuals.
Connections
First layer of the knowledge graphSources
Source keys reference the bodies this profile draws on. Full citations will connect to a dedicated source database in a later version. No citations are fabricated.
International Union for Conservation of Nature
Convention on International Trade in Endangered Species
U.S. National Oceanic and Atmospheric Administration
International Whaling Commission
Smithsonian Institution