the animals that hibernate are unable to handle the conditions like bears they are unable to handle the drop in food supply
Snow and freezing weather take away their usual food sources, so they need to find a way to survive the winter. Eating and storing fat, then going into a deep sleep until Spring makes it possible to...
so they will be strong
Because hibernation utilises the energy from the food already stored in the body and also minimises the metabolic activity.
hibernat: bears, badgers, cicadas, ectmigrate: crocodiles (for water) sloths, and basicly all herd animals e.g. zebra, wildebeest,