Sandflies are tiny little insects that breed in tidal flats in coastal lagoons, estuaries and mangrove swamps.
They do not cause disease in Australia.
Most bites occur at dawn and dusk and, as with mosquitoes, your best defence is repellents and long-sleeved clothing.
People who are new to Tropical North Queensland may react to sandfly bites with itchiness and swelling.
Antiseptic creams can be applied to relieve itching and stop infections.