Fig. 2. Average apportionment of total evaporation in Inca doves at 42°C. Buccopharyngeal and non-buccopharyngeal evaporation were directly and separately measured. Cutaneous evaporation was defined as the whole of non-buccopharyngeal evaporation during `Sealed' trials, in which cloacae were occluded. Cloacal evaporation was calculated as non-buccopharyngeal evaporation during `Unsealed' trials minus non-buccopharyngeal evaporation during `Sealed' trials. Values in parentheses indicate average rates of evaporative heat loss.