Do flies taste with their tongues?

No—mostly because they don’t have tongues! Flies taste with their feet. First they step on food. If their feet tell them it tastes good, they eat it. But flies can’t eat solid foods. They can only sip liquids. House flies and fruit flies soak up liquids with their mouth parts and then sip the liquid. Or they drop saliva on solid food, changing it into a liquid that they then drink. Sand flies, stable flies, and female mosquitoes have sharp mouth parts. They stab the victim and then sip its blood.