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Etymology
In spit of the species' common name "pygmy chimpanzee", the bonobo is not especially diminutive when compared to the common chimpanzee, with exception of its head. The appellative "pygmy" is attributable to the species' namer, Ernst Schwarz, who classified the species on the basis of a previously mislabeled bonobo cranium, noting its diminutive size compared to chimpanzee skulls.

The name "bonobo" first appeared in 1954, when Austrian zoologist Eduard Paul Tratz and German biologist Heinz Heck proposed it as a new and separate generic term for pygmy chimpanzees. The name is thought to derive from a misspelling on a shipping crate from the town of Bolobo on the Congo River near the location from which the first bonobo specimens were collected in the 1920s.