S1 Data. Numerical data. Numerical data used in preparation of Figs 1 and 4; Tables 1, 2, 3
and 4; S1, S2 and S3 Figs.
(XLSX)
S2 Fig. Heat loss (% of total) in Southern Yellow-billed Hornbills. Heat loss as a proportion
of total body heat loss (%) plotted against air temperature (Ta) of torso, gular skin, the beak as
a whole and lower mandible of the beak in Southern Yellow-billed Hornbills (Tockus leucomelas).
Data above the panting initiation temperature (Ta = 37.4 ± 2.1°C) has not been included
in this graph since evaporative heat loss has not been assessed and this makes total heat loss
after initiation of panting incomplete.
(TIF)
S3 Fig. Relative humidity (%) and water vapour pressure (kPa) in the temperature cabinet.
Relative humidity (%) and water vapour pressure (kPa) in the temperature cabinet in response
to air temperature (°C). Data are combined from all the individual experiments. Error bars represent
SE.
(TIF)
S1 Text. Additional methods for heat transfer calculation
(DOCX)
S1 Video. Thermal imaging sequence of the Southern Yellow-billed Hornbill. Thermal
imaging sequence of the Southern Yellow-billed Hornbill (Tockus leucomelas) during the experiment.
(MP4)