No-see-ums, also known as biting midges, are tiny flying insects that are often hard to see due to their small size, typically measuring just 1/16 to 1/8 of an inch long. They thrive in warm, humid environments, making them common in coastal areas and wetlands. Despite their size, their bites can be quite painful and cause itchy welts on the skin. These pesky insects are most active during dawn and dusk, which is when people are often outdoors enjoying nature. To protect yourself from no-see-ums, wearing long sleeves and using insect repellent can help keep them at bay.