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Figure 3


Fig. 3. (A) Bill surface temperatures increased during stepwise hypoxia in bar-headed geese (light grey triangles), greylag geese (black squares) and pekin ducks (dark grey circles). This increase became significant much earlier in greylag geese (black arrow) and pekin ducks (dark grey arrow) than in bar-headed geese (light grey broken arrow), and was lower in bar-headed geese during 9% inspired O2 (asterisk). (B) Bill temperature decreased after the first minute of normoxic recovery in bar-headed geese (light grey broken arrow) and greylag geese (black arrow) and after the second minute in pekin ducks (dark grey arrow). The bill temperature change in each individual was determined by subtracting its pre-hypoxia value (see Results). Representative thermal images are shown in Fig. 2.





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