The Dawn of the World: Beliefs Concerning Animals: Ki'...
The Dawn of the World, by C. Hart Merriam, [1910]
The Middle Mewuk of Stanislaus River region say:
Ki'-ki'-ah, the Crested Bluejay of the mountains, plants acorns so that oak trees come up almost everywhere.
[Several other tribes mention the same habit which, by the way, is hardly a myth.]