The sand fly is a small, blood-sucking insect belonging to the family Psychodidae. These flies are typically found in sandy or coastal areas and are most active during dusk and dawn. They are known for their painful bites, which can cause irritation and allergic reactions in some individuals. Sand flies are also significant because they can transmit diseases, such as leishmaniasis, a parasitic infection that affects the skin and internal organs. Their life cycle includes both aquatic larvae and adult flies, with females requiring blood meals to develop their eggs. Proper precautions can help reduce the risk of bites and disease transmission.