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Fig. 4. (A,B) Changes in body temperature (dTb/dt) and (B,D) dry heat transfer coefficient h of captive-reared Houbara bustards during summer (September 1997) (open circles, solid line) and during winter (December 1999) (filled circles, dotted line) and of wild birds during winter (December 1999) (filled squares, dashed line) at 35 (A,C) and 50°C (B,D). Significant differences among groups are indicated in the top left corner: NS, not significant; *P<0.05.