Kai-n-Tiku-Aba

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In Kiribati mythology (specifically: Kiribati), Kai-n-Tiku-Aba ("tree of many branches") is a sacred tree located in Samoa, which grew on the back of a man named Na Abitu. Koura-Abi, a destructive man, broke it. Sorrowful, the people of Samoa scattered across the world.

This myth is from Kiribati, and explains why the I-Kiribati migrated to Kiribati from Samoa.