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A killer whale (also called an orca) was a marine mammal. The largest member of the dolphin family, it was characterised by its black body, white underbelly, and the white, eye-like patches above both of its actual eyes.
In 1994, Dudley Dursley was described as having reached "roughly the size and weight of a young killer whale," prompting the Smeltings school nurse to urge his his mother and father to place him on a diet.