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HeiHei is on track to break the Guiness book of records to become the oldest chicken
(sh.itjust.works)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
"Heihei" translates to "chicken".
So there is no guarantee that childhood "Heihei", Moana 1 "Heihei" and Moana 2 "Heihei" are all the same chicken.
Sure Moana 1 & Moana 2 are probably the same. But childhood "Heihei", probably a different chicken.