Fulvous Harvest Mouse (Reithrodontomys fulvescens) lives in dry scrub land across Central and South America. Its conservation status is Least Concern.
Fascinating facts about the Fulvous Harvest Mouse
- The fulvous harvest mouse spans a surprising size range: its total length measures between 134 and 189 mm, while the tail adds another 73 to 116 mm, making the tail up to half again as long as the rest of the animal. Adults weigh just 9 to 14 g, yet their tail can be 10%-50% longer than head-plus-body combined.
- From Arizona to Mississippi, the fulvous harvest mouse occupies a continent-spanning belt that reaches as far north as southeastern Nebraska and southwestern Missouri and stretches south through Mexico into El Salvador. It thrives up to 2,590.8 m (8,500 ft) near Mexico City.
- In the cooler months, these mice become miniature fat banks: starting in November they begin storing body fat, which peaks in January and is gradually drawn down by April. Simultaneously, their fur lengthens, and they may lower their daytime body temperature while sleeping, a daily torpor that conserves energy. When a cold snap drops them into hypothermia, they rebound quickly, warming up and resuming activity within minutes, an adaptation that lets them survive harsh winters without hibernating.
- Breeding runs from February to October, with two peaks, late spring and early autumn, mirroring the bimodal pattern seen in Texas. Litters usually contain two to four pups, though up to seven have been recorded, and gestation lasts 21-23 days, producing newborns that weigh just 1-1.2 g. Eyes open between day 9 and 12, weaning occurs by day 13-16, and juveniles leave the nest at about five weeks.
- Season dictates the fulvous harvest mouse's menu: in spring and summer, insects dominate, making up about 90% of annual intake, while in autumn and winter seeds become the primary fuel. In a Mexican cloud forest, dry-hot seasons saw diets of 41% dicot seeds and 21.9% insects, whereas wet seasons shifted to 38.8% dicot fruit and only 2.9% insects. This dietary flexibility links food availability to reproductive timing.
Sources
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At a glance
RangeCentral and South America
HabitatDry scrub land
DietSeeds and insects
About the Fulvous Harvest Mouse
In the lush undergrowth of the American Southeast, the Fulvous Harvest Mouse weaves a secretive existence, its tawny fur blending seamlessly with the sun-dappled soil as it scurries through the dense vegetation with an air of quiet purpose. With each fleeting glimpse, this diminutive creature reveals a remarkable adaptability, its slender body navigating the intricate network of grasses and wildflowers with an effortless agility that belies its tiny stature. As it darts through the shadows, the Fulvous Harvest Mouse embodies the very essence of wildness, a tiny, unassuming monarch of the hidden world that lies just beyond our feet.
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