### Identification The *Orcinus orca* is the ocean’s most unmistakable monolith. Reaching up to 30 feet, these apex predators sport a striking jet-black back and a brilliant white underside. Look for the white eye patch just above and behind the eye, and the grey "saddle patch" tucked behind the dorsal fin—a feature as unique as a human fingerprint. In the field, the most prominent mark is the dorsal fin: in mature males, it is a towering, six-foot vertical triangle; in females and juveniles, it is shorter and more falcate (curved). Unlike the all-black False Killer Whale or the scarred Risso’s Dolphin, the Orca’s crisp, high-contrast coloration and massive size leave little room for doubt.
### Habitat & Range Orcas have a truly cosmopolitan distribution, inhabiting every ocean on Earth. While they are most abundant in the cold, nutrient-rich waters of the Pacific Northwest, Norway, and Antarctica, they are occasionally sighted in tropical lagoons. They thrive in both deep pelagic zones and shallow coastal fjords, showing a remarkable ability to adapt to diverse marine ecosystems regardless of depth or temperature.
### Behaviour Observing Orcas is a lesson in complex social dynamics. They live in tight-knit matrilineal pods led by an elder female. You’ll see them "spyhopping" (popping their heads vertically out of the water) to survey the surface or "breaching" in explosive displays of power. They are highly vocal, using distinct "dialects" to communicate. Their hunting is a coordinated masterpiece; whether it’s "wave-washing" seals off ice floes or herding herring into "bait balls," their teamwork is unparalleled in the animal kingdom.
### Diet Orcas are generalists as a species but specialists as individuals. Different "ecotypes" have evolved specific diets: "Residents" may eat only salmon, while "Transients" (Biggs) hunt marine mammals like harbor seals and even minke whales. They use sophisticated echolocation to track prey, often silencing their clicks when hunting stealthy mammals.
### Fascinating Fact Orcas are one of the only species on Earth—alongside humans and short-finned pilot whales—where females undergo menopause. These "grandmother" orcas live for decades after they stop breeding, acting as vital repositories of ecological knowledge, leading the pod to ancient hunting grounds during lean years.