The primary food source for bears varies by species and season, but generally, they are omnivorous, consuming a wide range of food. Commonly, bears will eat berries, nuts, roots, and grasses, along with fish and small mammals during salmon runs or other seasonal abundance. In fall, many bears significantly increase their food intake to prepare for hibernation, focusing on high-calorie foods to build fat reserves. During other times of the year, they might also scavenge for carrion or hunt wildlife when necessary. Their adaptable diets help them survive in diverse environments.