Biologists say “fishes” when they mean multiple species of fish (http://grammarist.com/usage/fish-fishes/). Chances are they say mouses when they mean multiple species of mouse, too.
Even if they don’t, it still is valid as a word. Many people think the plural of “computer mouse” is “computer mouses”.
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[ 42.5 ms ] story [ 22.0 ms ] threadEven if they don’t, it still is valid as a word. Many people think the plural of “computer mouse” is “computer mouses”.