When my sister found this strange silvery bug crawling inside her cupboard, she thought nothing of it — until she felt a sharp sting on her hand and realized these things weren’t as harmless as they looked. Over the next few days, she spotted more of them around the neighborhood, hiding in corners, bookshelves, and bathrooms. That’s when we decided to find out what they were.

It turns out the culprit is a silverfish — a small, wingless insect with a metallic sheen and a quick, darting movement. These creatures have been around for over 400 million years, making them one of the oldest insects on Earth. They thrive in dark, humid places like basements, cupboards, and bathrooms, feeding on starches, sugars, and even glue.

While silverfish don’t typically bite humans, their fast movements can cause irritation or even mild allergic reactions in some people who are sensitive to their scales or droppings. What’s more alarming is that they can damage your belongings — feeding on clothing, wallpaper, and stored food.

Experts say that seeing one usually means there are many more hiding nearby. Silverfish are nocturnal and prefer to move unseen, making them difficult to detect until an infestation has already spread.

To protect your home:

Keep areas dry and well-ventilated, since they thrive in moisture.
Store books, papers, and fabrics in sealed containers.
Use natural repellents like cedar oil, lavender, or citrus peels.
Seal cracks and gaps where they can hide or breed.
Finding a silverfish isn’t just a random occurrence — it’s a warning sign that your home offers the perfect environment for pests. Once you see one, it’s time to act fast before your cupboards, walls, and bookshelves become their permanent home.