The Yellow Mystery Egg is one of the six Stop 'n' Swop eggs found in Banjo Kazooie. It can be found in Click Clock Wood during the winter season. It is inside Nabnut's house on a table. In Banjo-Tooie, the Yellow Mystery Egg is in Heggy's Egg Shed, but Kazooie must hatch it herself. If hatched, you will unlock a Jinjo in multiplayer.