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The Killer Whale, also called Orca, is the largest oceanic dolphin. They inhabit almost all of the worlds oceans aside from the Baltic and the Black Sea and little bits of the Arctic Ocean. They're mostly black with a white belly and a white spot above the eye and ear. Males are around 6-8 meters long, weighing around 6 tonnes, with females being roughly a meter shorter. Males also have a long, straight dorsal fin while the females is short and bowed. Their skeletons are more robust than other dolphins. They have good eyesight and excellent hearing. Like other dolphins, they can use echolocation.

Killer Whales are apex predators and feed on sea birds, sea turtles, cephalopods, fish, including great white sharks, and mammals, including seals, other dolphin species and rarely even adult whales. The Orca pods may specialize more toward specific types of food and develop hunting techniques depening on their prey. These hunting techniques are passed down the generations and may be completely unknown to other pods. While they may hunt alone, a lot of their hunting behaviour is based on pack hunting and often resembles that of wolves or african wild dogs. They have the reputation of being absolutely ruthless and cruel. Great White Sharks have been observed "fleeing" an area if a pod of Orcas arrives. They usually stun their prey with a headbutt or a strong strike with their tail fluke. Other notable hunting and killing techniques include surrounding and drowning other cetaceans by preventing them from resurfacing, throwing seals through the air, beaching on shallow waters and wiggling back into the ocean, and chasing large prey until exhaustion.

Killer Whales form as complex societal structures as higher primates and elephants. These groups can differ depending on the region. The "resident" Orcas of the pacific live in close family groups consisting of the eldest female, her offspring and their offspring. The pods consist of a few of these family groups and in turn, multiple pods form a clan. Pods inside a clan have similar vocal patterns and heritage to one another. Research suggests they have different languages depending on the region and different dialects within a language. Multiple of these clans loosely form a community which ocassionally commingle, likely to breed. The "transient" Orcas of other regions live in smaller family groups and, as opposed to the resident variety, may leave their maternal family over long periods of time or even permanently.

The resident Killer Whales almost constantly communicate with one another and they specialize in prey that cannot hear the frequency of their vocalizations. The transient Orcas however hunt marine mammals with better hearing, so their communication is limited to just a single short click sound at most during hunts. They are highly intelligent and playful. They quickly learn new things and react to measures taken against them by fishermen, such as the fishers attempts to trick them with decoys. Adults have been observed teaching their young behaviour and hunting techniques that are not natural to them, such as beaching. Captive Orcas in multiple marine parks have learned to bait birds using regurgitated fish and then taught the trick to others.