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Journal of Experimental Biology 90,267-281 (1981)
Published by Company of Biologists 1981

Temperature Regulation and Heat Balance in Flying White-necked Ravens, Corvus Cryptoleucus

DENNIS M. HUDSON ¹ and MARVIN H. BERNSTEIN ¹

¹ Department of Biology, New Mexico State University, Las Cruces, New Mexico 88003 U.S.A.

During level flight at 10 m.s^-1 in a wind tunnel, white-necked ravens (Corvus cryptoleucus, mass 0·48 kg) exhibited an increase in body temperature to steady-state levels as high as 45°C, exceeding resting levels by nearly 3°C. This reflects the storage of up to half of the metabolic heat produced (H^p) during 5 min of flight. During steady-state flight, body heat was dissipated in part by respiratory evaporation and convection (13-40% of H^p) evoked by increases in ventilation proportional to body temperature. Remaining heat was lost by cutaneous evaporation (10% of H^p) as well as by radiation and convection from the external body surface. The results suggest strategies that might be used by ravens during flight under desert conditions.

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