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The mule deer is named for its ears, which are large like those of the mule. Does may mate with more than one buck and go back into estrus within a month if they do not settle. The gestation period is about 190–200 days, with fawns born in the spring, staying with their mothers during the summer and being weaned in the fall after about 60–75 days. Mule deer females usually give birth to two fawns, although if it is their first time having a fawn, they often only have one.
The mule deer is a deer indigenous to western North America,They are generally more associated with the land west of the Missouri River, and more specifically with the Rocky Mountain region of North America.