Table 1.

Maximum T_s readings from infrared thermometer and thermographs in developing desert hamsters before (0 min) and after 30-min cold exposure at T_a 21°C.

Age (day)	Body mass (g)	Infrared thermometer		Thermal camera
		Ts 0 min (°C)	T–s 30 min (°C)	Ts 0 min (°C)	T–s 30 min (°C)
1	0.9 ± 0.1a	32.3 ± 1.0a	21.5 ± 0.3a	33.2 ± 1.3	23.1 ± 0.6a
5	1.9 ± 0.1b	32.9 ± 0.7ab	24.1 ± 0.2b	34.2 ± 1.0	26.6 ± 0.4b
8	2.7 ± 0.1c	33.5 ± 0.6bc	25.1 ± 0.4c	34.7 ± 0.7	28.2 ± 0.4c
10	3.4 ± 0.1d	34.1 ± 0.6d	26.3 ± 0.7d	34.7 ± 0.6	28.5 ± 1.3d
12	4.0 ± 0.2e	34.0 ± 0.5cd	30.0 ± 2.2e	34.0 ± 0.4	31.6 ± 2.3e
15	5.5 ± 0.3f	33.3 ± 0.4ab	34.2 ± 0.7f	33.9 ± 0.7	35.0 ± 0.7f

All values are means with SD for n = 8 individuals from 2 litters. Different letters in the same vertical row indicate significant differences among ages. RMANOVA, for body mass, F_5,35 = 491.0 and P < 0.001. For T_s measured after cold exposure of 0 or 30 min by using infrared thermometer, F_5,35 = 6.73, p < 0.001 and F_5,35 = 997.7, p < 0.001, respectively. For T_s measured after cold exposure of 0 or 30 min by using infrared thermal camera, F_5,35 = 3.25, p = 0.072 and F_5,35 = 103.2, p < 0.001, respectively.