🐐 Alpine Ibex Seasonal Elevation Migration: Lapse-Rate Heat Balance, Fur Insulation, Snow-Wading Cost and the Green-Wave Forage Trade-Off Lab

Why do ibex climb in summer and descend in winter? Compute an ibex's daily energy balance from lapse-rate air temperature, coat insulation with wind, snow-wading cost and a rising green-up band of forage, then find the best elevation for every day of the year.