וְכֹל֙ שֶׁ֣רֶץ הָע֔וֹף טָמֵ֥א ה֖וּא לָכֶ֑ם לֹ֖א יֵאָכֵֽלוּ׃
And all winged swarming things are unclean unto you; they shall not be eaten.
Rashi on Deuteronomy
שרץ העוף — These are the lowly creatures which move upon the ground: flies, hornets and the unclean species of grass-hoppers (cf. Rashi on Leviticus 11:20), come under the term of שרץ.