Twelve orca facts, fact-checked
The orca (Orcinus orca) is the ocean's apex predator and one of the strongest cases for culture in a non-human animal. Full profile in our orca guide.
1. Orcas are dolphins
The largest member of the dolphin family, Delphinidae — not whales, despite the name killer whale.
2. The name means whale killer
Sailors called them asesina de ballenas, whale killer, which flipped in translation. They do hunt large whales.
3. Every pod has a dialect
Pods use distinct call repertoires learned rather than inherited, and dialect similarity tracks how closely related pods are.
4. Hunting techniques are cultural
Wave-washing seals off ice floes, beaching to take sea lions, carousel-feeding herring — each is learned within a population, not universal to the species.
5. Ecotypes barely mix
Resident, transient and offshore orcas differ in diet, calls, appearance and social structure, and rarely interbreed despite overlapping ranges. Some researchers argue for splitting them into separate species.
6. Females go through menopause
Orcas are one of very few species where females stop reproducing and live decades afterwards, leading pods and holding ecological knowledge.
7. Matriarchs can pass 80
Sons in particular stay with their mothers for life, and survival rates drop when a matriarch dies.
8. They are found in every ocean
From the Arctic to the Antarctic — one of the most widely distributed mammals on Earth after humans.
9. They hunt great white sharks
Some orcas specialise in shark livers. Great whites abandon an area for months after orcas appear.
10. Dorsal fins collapse in captivity
Fin collapse is common in captive males and rare in the wild — one of the clearest visible welfare markers in any captive animal.
11. Southern Residents are in serious trouble
This small Pacific Northwest population is declining through chinook salmon shortage, vessel noise disrupting echolocation, and accumulated pollutants.
12. They are Data Deficient globally
Ecotypes differ so much that the IUCN cannot assess Orcinus orca as a single unit — individual populations are assessed separately.
Read the full orca wildlife guide for IUCN status, population context and sources — or donate to WARN to help fund the partner teams protecting wildlife on the ground.
