Usage Note
Mosca is the common housefly. The idiom no matar ni una mosca ('wouldn't hurt a fly') exists in Spanish just as in English. Tener la mosca detrás de la oreja (literally 'to have the fly behind the ear') means to be suspicious or sense something is wrong — a uniquely Spanish idiom with no English equivalent. The plural moscas is regular.
Examples
"Hay una mosca en mi vaso."
Natural Translation
There is a fly in my glass.
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