Flies are insects. They have certain instinct and reaction ability, but they have no IQ. IQ refers to human cognitive ability and intelligence level, including thinking, reasoning, judgment, memory, language and creativity. Flies have no similar cognitive ability. They can only respond to external stimuli through instinct and reflection, for example, they will fly past when smelling the taste of food, and they will quickly flee when they see their hands waving quickly. Therefore, flies have no concept of IQ.