Living Logs are Items dropped by deceased Treeguards. They can also be obtained by chopping down Totally Normal Trees, the stump of Totally Normal Tree can be dug for another Living Log. Wormwood can always "craft" Living Logs at the cost of 20 Health.
They are used to craft several magic items, including a Shadow Manipulator, and can also be used as fuel for a Fire. Living Logs will scream when burned on a fire and when eaten by the Werebeaver form of Woodie or the Doydoy, though this has no effect on gameplay.
A Living Log may be used to repair a Wood Wall. This works in a similar fashion to using a standard log, except that the Living Log repairs three times the wall health of a standard log.
In Don't Starve, the base game, Woodie in Werebeaver form can quickly obtain Living Logs. The Werebeaver can quickly destroy a lot of Trees, which will likely spawn Treeguards. Its powerful attacks and its ability to quickly heal by eating Logs allows the Treeguards to be dispatched with relative ease.
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/behavior/function/tags of these items