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Fig. 4. The relationship between flushing movements and the
PO2 profiles surrounding echidnas while buried
in two different media. Movements, shown by the dotted vertical lines, are
associated with fluctuations in PO2 until a
steady state is reached where the PO2 levels
stay constant over time. Different symbols represent the
PO2 values in the medium away from the snout
region of the echidna. (A) Typical echidnas buried in kitty litter. (B)
Typical echidnas buried in coarse sand.