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Fig. 3. Head temperature excess ratio (Rh) and abdominal temperature excess ratio (Rab) decline with air temperature (Ta) in hovering Euglossa imperialis. Least-squares regressions: Rab=-0.016Ta+0.846, r2=0.16, P=0.0213; Rh=-0.032Ta+1.475, r2=0.395, P<0.0001.