Respect for animals is a major feature of Sioux culture throughout Black Elk Speaks. The bison herd, for example, is central to the Sioux way of life; its existence is incorporated into ritualized hunting practices and feasting, and bison are killed with economy: Nothing is wasted, Black Elk says, in contrast to their arbitrary slaughter for sport by whites. The horses, which were so important to the Sioux for warring and hunting, are cared for and guarded carefully. They become sacred animals in Black Elk's vision, which he later enacts as the "horse dance." Black Elk's vision sensitizes him to animals; he can hardly bear to hunt after having the vision, and he feels a special kinship with the eagle after being given the power name Eagle Wing Stretches. In a small-but-touching episode, during the Canadian exile of the Oglala, Black Elk and the men he is with hear porcupines crying in the cold and do not harm them as they seek the warmth of their shelter.
Not only animals reflect the Sioux's relationship with nature. Voices of thunder and flying men in Black Elk's vision take him through the sky to a tepee made of clouds with a rainbow for a door. Ever after, for him, the sound of thunder will evoke the world of that vision, and he will look forward to rain as a visit from the spirit world. Black Elk describes spring several times as that time when "the grass shows its tender faces," so that it, too, is personified and a relative of human beings. The rain falling softly at the end of Black Elk Speaks is a validation of Black Elk's belief.
