Fig. 4
From: The bare head of the Northern bald ibis (Geronticus eremita) fulfills a thermoregulatory function
Variation in estimated heat loss for the bare head skin (a, b) and the bill (c, d) of Northern bald ibises along a range of Ta. Both absolute heat loss values and percentage of total heat loss (the summed heat loss of head, bill and feathered body) are shown for each body region. Symbols represent mean ± s.e. Red symbols include measurements taken on birds in the shade and directly exposed to sun light, while blue symbols only include measurements on birds in the shade