Have you ever gone for a relaxing walk through a park, field, or trail, only to look down later and notice your pant legs covered in tiny clingy bits? It can be surprising—and a little confusing—especially if they seem to appear out of nowhere.

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While they might look mysterious at first, the explanation is actually quite simple and completely natural.

In most cases, those tiny hitchhikers are plant seeds, commonly known as burrs or stickseeds. Certain plants have evolved a clever survival strategy that allows their seeds to latch onto passing animals—or people—to travel to new locations.

Common hitchhiking plants include beggar’s lice, burdock, goosegrass (also called cleavers), and sandbur. They’re especially common along trails, in tall grass, or near wooded areas. To remove them, try using a lint roller, tape, or a fine-tooth comb.

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It’s best to brush them off outdoors to avoid spreading seeds inside your home. A quick wash afterward helps remove any lingering bits—and don’t forget to check pets that joined you on the walk. Nature is full of clever surprises, even on your.