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Figure 3


Fig. 3. Hibernating Tb for a male echidna (echidna 1E7C, mass range 3.2–5.2 kg; A) plotted against reference soil temperature at a depth of 20 cm (Tref) for five hibernating seasons, and for a female echidna (echidna 006F, mass range 2.3–3.0 kg; B) for six hibernating seasons. Solid lines are regressions fitted to all data. For echidna 1E7C (A) Tb=0.65Tref+4.3, r2=0.84; for echidna 006F (B) Tb=0.62Tref+4.3, r2=0.82. The fact that the slopes are significantly less than 1 shows that at high Ta echidnas seek out cooler areas to hibernate, while at low Ta they move to relatively warmer areas.





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