In the modoc myth what do the grizzly bears do that angers the Chief of the sky spirits

In the Madoc Myth the grizzlies married the daughter of the Chief of the sky spirit and created a new race, when the chief of the sky spirit came to see he was mad at them and according to the myth took his daughter back to sky.

It is said that Grizzlies were the first ancestors Native Americans and that is why they do not hunt or kill grizzlies.