It is known, however, that turtles incubated at temperatures above the typical 20 to 30☌ often develop faster. They are normally incubated for about 50 days, although incubation period ranges have not yet been published. Incubation time for eggs is temperature-dependent. Egg width is directly related to pelvic width of the female, but not her overall body size. The eggs of the western box turtle are relatively large compared to other species in the Family Emydidae. Average basal metabolic rate 0.158 cm3.O2/g/hr.Range basal metabolic rate 0.05 to 0.30 cm3.O2/g/hr.( Bernstein and Black, 2005 Blair, 1976 Costanzo, 1982 Gatten, Jr., 1974 Metcalf and Metcalf, 1985 Miller and Birchard, 2005 Packard, et al., 1985 St. Typically their metabolic rates are between 0.05 to 0.30 ml/h, with averages at 0.158 ml/h. ornata prefer temperature ranges from 25 to 30☌ year round. Differences in the average shell size between females and males is generally contributed to the fact that females tend to be slightly larger than males. The plastron averages 120 mm long for females and 116 mm long for males. Although still roughly dome-shaped, western box turtles are known for having relatively convex carapaces. The carapace averages 120 mm in length for adults. On average, adults weigh between 198 to 538 g. A female's eyes and head are typically brown or black. Bright red eyes and green heads are characteristic of males, with brighter colors perhaps improving reproductive success. Additionally, sexual dichromatism exists in this species. luteola has more yellow stripes on their shells and body than T. All adults have yellow spots on their heads, but subspecies T. They have concentric rings on their shells that are indicative of their age, as well as elaborate thick, yellow lines that surround their scutes. The bulk of this species' shell, tail, head, and limbs are mostly dark brown or black in color.
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