Wikipedia
Natsilane is one of the Tlingit and Haida stories about how the various supernatural animal species from the Tlingit culture of the American Northwest coast were created. These stories follow an almost dreamtime-like description of humans and other animal species living completely harmoniously. The animals are depicted as demi-gods, and are always referred to in the singular (for instance " raccoon", and " raven"). The story of Natsilane follows the creation of arguably the most important creature in Haida culture - the "Blackfish", or killer whale. There are other similar stories including how Raccoon got the rings on his tail and why Puma hides in the forest so much.
Blackfish is revered so highly in Tlingit culture because of his apparent affinity with humans. He represents an extremely powerful force of nature, deadly and terrifying to every creature except man, whom he is said to look after. The story describes why this is so. There are many variations to the tale, some considerably more brutal than others, and the exact story is likely to vary widely in Tlingit culture, but the main theme of the story is always the same.