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Fig. 4. Example trace of a typical burrowing trial (female mouse, 36.1 g, excurrent
airflow rate=1.6 l min-1). The mouse was placed in the chamber at
the point indicated on the graph. It then explored the chamber and scratched
at the soil for
3 min, rested for
1 min and burrowed for
35
min. The washout after the mouse was placed in the chamber suggests an
equilibration time of approximately 5 min. FO2,
fractional oxygen concentration.