Whether you’re walking along a city sidewalk or hiking deep in the forest, you might occasionally notice paint marks on tree trunks. Those marks are codes used by forestry workers and contractors to ...

If you spend enough time surrounded by trees, you may come across some that have been marked with various colors of spray paint, using different symbols, letters, or numbers. In most cases, this is a ...

An orange circle painted on a tree in the woods - Mbprojekt_maciej_bledowski/Getty Images It's not unusual to spot markings on trees while walking through wooded areas, but one color, in particular, ...

While each product featured is independently selected by our editors, we may include paid promotion. If you buy something through our links, we may earn commission. Read more about our Product Review ...