However, on average, males and females are about the same size. Newborns can be 1.5–2.1 m (4.9–6.9 ft) in length.[1][12] Body temperature ranges from 36–37.2 °C (96.8–99.0 °F), increasing during activity.[3] The teeth are conical, and there are 14–21 in the upper jaw and 16–24 in the lower.[4]