Feeding Tuxie

Feeding Tuxie is the name given to an anomaly in Cool, Cool Mountain where the baby Penguin, Tuxie's head is looking upwards and opening and closing it's beak, similarly to a baby bird awaiting food. It was originally believed to be a model corruption until further inspection. This anomaly usually only appears after Lil' Penguin Lost, and the Tuxie look-a-like will not appear on top of the house next to the Mother Penguin. Bringing Feeding Tuxie still results in the regular dialogue when talking to Mother Penguin when Tuxie is still missing.

Star
In some copies of Super Mario 64, a star can be obtained from Feeding Tuxie when a random item can appear that can be fed to Tuxie, and a star will then appear.