Theory 50/Hibernation/Threshold lens
Entry Needs a Fat Threshold
The claim
Hibernation entry requires a threshold in the ratio of fat reserves to body mass, so an animal below it must stay active and risk winter.
01Mechanism
Survival through winter requires enough stored energy to fund arousal costs; below the threshold, hibernation is lethal.
02Prediction
Entry should track the fat ratio.
03Refutation
Entry tracking temperature would remove the reserve condition.