Meadow jumping mice range in length from 180 to 240 mm, with the tail making up 108 to 165 mm of that length. The hind feet are 28 to 35 mm long.
Mass varies quite a bit with the season. Summer weights range between 11.15 and 24.8 grams, averaging between 16 and 19 g. Before hibernation, meadow jumping mice may reach weights up to, or greater than, 35 g. Females may sometimes be slightly larger and weigh more than males.
Meadow jumping mice are recognized for their extremely long tails and long hind feet. Small and slender, they differ from woodland jumping mice in that they do not have a white-tipped tail and are generally duller in color. Adults have a dark or olive brown band on their back, which is paler in juveniles. The sides are a pale yellowish-brown, with black hairs lining them, and the underparts are white or buffy-white. The tail has few hairs, is dark brown on top and yellow-white on the bottom, and is longer than the body. The coat is short, thick, and mostly coarse. These mice undergo a yearly molt that usually starts after mid-June for adults or in August for the juveniles and lasts for about three weeks. Meadow jumping mice have small and delicate forelimbs with four toes on each foot. The hind limbs are longer and have five toes. The bottoms of the feet are naked. The head is small and narrow, and the nose is short and pointed. Meadow jumping mice are the only mammal with eighteen teeth.
Range mass: 12 to 30 g.
Average mass: 18.25 g.
Range length: 180 to 240 mm.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: female larger
Average basal metabolic rate: 0.219 W.
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