Thermal Exchange Between the Raven (Corvus corax) and Its Environment.
AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
Continuous V02 and TB of five birds were measured for 13 hrs as temperatures were varied every two hrs 15C, 0C, and 30C or four hrs -45C. Significant seasonal differences in absolute V02 and TB responses were observed, but little seasonal effects were seen if these data were normalized. Surface temperatures of feathers of five ravens were measured at temperatures of 40C to -45C. The surface temperatures of the feathers were nearly identical to microenvironmental temperatures with the exception of the warmer eye auricular region, the nares, leading edge of the marginal coverts and the unfeathered portions of the legs and feet. The measured effective radiative surface areas were 80 to 100 percent higher than the measured bare surface areas. Surface temperatures of flying birds showed the head, legs, feet, and region of the body under the wings to be much warmer than the rest of the body which remained within 1 to 2C of ambient temperature 21C.
- Anatomy and Physiology