Fig. 3. Effects of four treatments on plasma corticosterone levels of (A) female and (B) male water skinks (Eulamprus heatwolei) at 1 h, 2 h and 14 days since initiation of the respective treatments, and in response to the application of a `novel' stressor (having a blood sample taken, then being chased around an enclosure for 30 s) 14 days after the initial treatment initiation. Sample sizes for treatments were: control, N=16; tail autotomy, N=16; microchip insertion, N=20; toe-clip, N=10, and samples consist of equal numbers of males and female lizards. Values are means ± s.e.m.