One such mutation (there are probably others) is designated "short ear" and is known in labs. I am unsure if this is the variant that people in the US (and elsewhere?) have, but it's a bit difficult to find information on.
If you search for earlessness and mice, you will find, if your searches are anything like mine, a lot of sites with pictures a mouse growing a human ear on its back, so be warned (they're pretty gross-looking).
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