FIELD STATION 06 / NORTH COPSE / 54°12'N
190 surface8 deep torpor
Beneath the frozen leaf-mould, time becomes biological. Follow one small heart from panic-bright autumn to the long, blue interval of eight beats per minute.
22 OCTOBER · 21:14
H-17 circles the hawthorn twice, pushes through a seam in the leaves, and disappears. Within six hours her oxygen use has fallen by 94%. The body is not switched off. It is budgeting.
Scroll slowly. She is.
Choose a den to rotate the station’s specimen table. Each cross-section is drawn from the 2029–30 North Copse survey.
Erinaceus europaeus
Oak, beech and grass braided into a weatherproof sphere. The entrance collapses behind its maker; rain beads on the outer leaves while an inner air pocket stays nearly still.
Deep torpor is punctured by awakenings. In a few hours, heart rate climbs twentyfold and the animal spends weeks’ worth of saved fuel. Why take the risk? The station log holds three answers.
THE MAINTENANCE HYPOTHESIS
Cold slows immune chemistry along with everything else. During this arousal, H-17’s white-cell traffic tripled. The field team recorded no feeding, grooming or movement beyond the nest: heat itself was the task.
No cupboard. No cache. Just stored summer, measured in grams and slowly spent in darkness.
Drag the brass marker. The ledger recalculates a winter from the same 1.60 g nightly burn measured in H-17’s nest.
Enough for a late March emergence, with a narrow 1.7-week reserve.
After twelve clear nights the frost moves down through the soil. Set the nest depth and watch whether H-17 remains inside the buffered layer beneath it.
Safe margin: 7 cm beneath frost
02 APRIL · 05:51 · AIR 9.4°C
At 05:51, H-17 opens the leaf seal. She has lost 31% of her autumn mass. Her first breath outside makes a white cloud; her second catches the scent of wet sorrel. The station’s winter ends here. Hers begins again.
Return to first frost ↗