Trees At Big Thicket National Preserve

Cypress trees

The trails of Big Thicket take visitors through many natural wonders, such as rich forests full of cypress and tupelo trees. In all, there are 85 different types of trees in Big Thicket. This is a great image showing the "knees" of a cypress tree—the small protrusions on the trunk. Scientists are not entirely sure of their purpose.

Photo by Annie Bradford/Flickr