Fig. 4. Mean stomach temperature (± s.e.m.) of double-crested cormorants during HIF trials at air temperatures within their thermoneutral zone (N=5 birds, n=12 trials). The temperature drop at 0 min is caused by the ingestion of a 100 g herring. Note that temperature reaches pre-ingestion levels within 40 min of eating the fish, after which temperature remains stable throughout the remainder of the trial.