Treadwell was to leave the park at his usual time of year, but extended his stay a week in an effort to locate a favorite female brown bear. He said he hated modern civilization and felt better in nature with the bears than he did in big cities around humans. The bears he had been used to during the summer had already gone into hibernation, and bears that Treadwell did not know from other parts of the park were moving into the area. Some of the last footage taken by Treadwell, hours before his death, includes video of a bear diving into the river repeatedly for a piece of dead salmon. Treadwell mentioned in the footage that he did not feel entirely comfortable around that particular bear. In "Grizzly Man", Herzog speculates on whether Treadwell filmed the very bear that killed him.