Masks and masking played important roles in some indian cultures. the kwakiutl mask called crooked beak:

the Kwakiutl mask called crooked beak is one of four monstrous beings who eat human flesh

In indian cultures, crooked beak has the power to granted humans with various forms of Mystical power. But he often trapped many humans into a pit and eat all of the brains while accompanied by bird that will eat the remaining humans' brains.