The correct option is that hibernation can be observed in bats, bears, and rodents. Hibernation is a critical survival strategy employed by some mammals to cope with harsher environmental conditions such as cold temperatures and food scarcity. During hibernation, these animals enter a state of significantly reduced metabolic activity, which allows them to conserve energy when resources are limited. This phenomenon highlights the adaptive strategies of mammals in response to seasonal changes, a concept often discussed in UPSC-level ecology and biology contexts, emphasizing the intricacies of animal behavior and adaptation.