Figure 1

Temperature profiles for C. medius (a, b) and C. crossleyi (c, d) occupying poorly-insulated (a, c) or highly-insulated (b, d) hibernacula.

For C. medius: skin (solid black), tree hole (solid grey) and ambient (dotted) temperature; for C. crossleyi: skin (solid black), nest or underground (solid grey) and ambient (dotted) temperature. Note C. crossleyi is not exposed to temperatures above 30 °C while occupying nests (c) and displays low skin temperature when occupying underground hibernacula (d) compared to C. medius hibernating inside highly-insulated tree holes (b). Vertical lines, midnight; black bars, dark phase. Data for C. medius (Dausmann, unplubl.) were collected in July and August at Kirindy CFPF; data for C. crossleyi (this study) were gathered between May and June 2012 at Tsinjoarivo (starting and ending dates are indicated by numbers above vertical lines).