Smoky the Bear is probably the best-known animal firefighter, but the North American beaver is the one doing the heavy lifting.

A tree stump might look like the sad ending of a tree’s story. But to a sharp-eyed observer, that remnant can be the beginning of one.

When I walk through an evergreen forest, I like to keep track of which way the trees twist. Many conifers have a spiral grain in their wood, meaning the fibers run in a gentle helix around the trunk rather than straight up and down.

It's that time of year when many of our sidewalks are stained dark purple with the fruit of the Mulberry tree, whose history is long and complicated.

Fine tree roots are adventurers who hunt for ways to keep their tree watered and vibrant.

Most of us have heard that you can tell how old a tree is by looking at the rings in a cross section of its trunk. But the scientists who work at the Center for Tree-Ring Science are finding more than just a tree’s age in them — they are also learning about their future.

National Geographic Explorer Brian Buma studies trees that live at the extreme. In 2020, he set out to answer a deceptively simple question: What is the world’s southernmost tree?

A native to India and parts of Southeast Asia, the Neem tree is something of a cure-all in those parts of the world. So, why aren't its healing properties in pharmacies all over the world?

City trees get their normal share of sunlight during the day, but when night comes, many of them also are exposed to human-made lights, which can change their natural patterns.

Treehoppers, one of the insect world's most beautiful creatures, also have a remarkable way of communicating.