Sandflies are small, flying insects belonging to the family Psychodidae. They are often found in warm, humid environments, particularly near beaches, marshes, and forests. Sandflies are most active during dusk and dawn, and their bites can cause itchy, red welts on the skin. These insects are known for transmitting diseases, such as leishmaniasis, which can affect both humans and animals. Sandflies are typically about 1 to 5 millimeters in length and have a distinctive hairy appearance. Their life cycle includes stages as eggs, larvae, pupae, and adults, with females requiring blood meals to reproduce.