Whether you’re walking along a city sidewalk or hiking deep in the forest, you might occasionally notice paint marks on tree trunks (or even a metal band once in a while). Those paint marks are codes ...

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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, ...

Several maple trees with white trunks - By Eve Livesey/Getty Images You may be lucky enough to live in or visit an area that has a variety of trees. What's perhaps even more surprising are the ...