Hapy is the one of the four sons of Horus depicted with a baboon head. His distinctive animal form became standard in the funerary art of ancient Egypt, especially on canopic jars and chests.
The four sons—Imsety, Hapy, Duamutef, and Qebehsenuef—protected the internal organs removed during mummification. Hapy was most commonly associated with the lungs, while Imsety guarded the liver, Duamutef the stomach, and Qebehsenuef the intestines. Ancient arrangements varied, however, so these assignments were not completely fixed.
Their familiar heads developed over time. In earlier periods, the sons could appear human or with different forms; during the New Kingdom, Hapy became the baboon-headed figure, Duamutef the jackal, and Qebehsenuef the falcon, while Imsety retained a human head. Hapy should not be confused with Hapi, the Nile-flood deity: the spellings overlap in modern transliteration, but they refer to different gods.