Description and Comparison With Similar Species
Western Harvest Mice have brownish fur with buff sides, a white belly, and an indistinct white stripe on the fur along the spine. Adults grow up to eleven to seventeen centimeters in length with a tail length of five to ten centimeters. Their height (from the ground to the highest point of their back) is between 1.5 and 2.0 centimeters. A mature mouse weighs anywhere from nine to twenty-two grams.
The Western Harvest Mouse is nocturnal, with particularly intense activity on very dark nights. This mouse is particularly resourceful, making use of the ground runways of other rodents. It is also a very agile climber. Its primary food source is seeds, but springtime dining is augmented with new plant growth. In June, July and August the mouse is known to consume certain insects, especially grasshoppers and caterpillars. Again resourceful, the Western harvest mouse stores seeds and other foodstuffs in underground vaults. Its many predators include the fox, weasel, coyote, hawk, snake and owl species.
Similar species are the Plains Harvest Mouse, which has a more distinct but narrower stripe on its spine, and the Fulvous Harvest Mouse, which has a longer tail. Also similar is the Salt Marsh Harvest Mouse, which has an underbelly fur that is more pinkish cinnamon to tawny. Finally, the House Mouse has incisors without grooves, unlike those of the Western Harvest Mouse.
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