Figure 2. Rates of heating and cooling in live reptile eggs compared to dead or inanimate controls.

(a) Live eggs of three snake species (Indian python, Carpet python and Chinese ratsnake) heated more rapidly than they cooled. (b) Controls either heated and cooled at similar rates, or heated more slowly than they cooled (a higher thermal time constant means slower rates of thermal change). Data are shown as mean ± SEM.