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Figure 2


Fig. 2. Surface temperatures (T) of the bill increased in bar-headed geese (BG, top row), greylag geese (GG, middle row) and pekin ducks (PD, bottom row) during stepwise hypoxia. Inspired O2 was reduced from 21% to 12%, 9%, 7%, and then in bar-headed geese only to 5%. Each level of hypoxia was sustained for 15 min. Scale bar, 10 cm.