Black bears can hibernate for up to 7 months without food or water (lines 1–2) - AQA - A-Level Biology - Question 10 - 2020 - Paper 1

Black bears can use fat stores for energy during hibernation. As their metabolic rate decreases, their energy consumption is reduced, allowing them to survive on minimal energy levels for extended periods. Additionally, lower activity levels mean less energy is expended, which further aids their survival without direct food or water intake. The utilization of fat helps maintain essential bodily functions while minimizing dependence on external food sources.