Fig. 3. Comparison of the relationships between T_carotid, T_brain and calculated cerebral blood flow (CBF) in pronghorn in the summer (A) and in winter (B) and in summer in horses (C). In winter the pronghorn temperature profiles are more similar to those in the horse than they are to pronghorn in summer. CBF above the upper maximum CBF (pink) or below the minimum (yellow) occur in pronghorn in the summer, rarely in the winter, and not in horses. In winter, most temperature gradients between T_brain and T_carotid in pronghorn and all gradients in horses can be achieved by changes in CBF. In summer, low and high gradients depend on SBC or brain warming. Summer pronghorn data are from Lust et al. (Lust et al., 2007). Horse data are from Mitchell et al. (Mitchell et al., 2006).