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Fig. A1. (A) Effect of efficiency of conversion of metabolic energy to mechanical
work against gravity and (B) mass of spoil (expressed as % of body mass)
carried in each trip to the surface on total burrow construction cost for
Notomys alexis. Filled symbol represents spoil mass used in model
calculations (4.4% and 25% for conversion efficiency and spoil mass,
respectively; total burrow cost=55.5 kJ).