Tree/Spiky

Spiky Trees are found only in the Marsh. Instead of dropping Logs when chopped like other trees, Spiky Trees drop Twigs with only a 20% chance to drop a Log. Also, these trees do not have a life-cycle (changing size over time). There is also no way to replant them. Like other trees, the stumps of the Spiky variety can be dug up with a Shovel or Regal Shovel to get an additional log.

Burning
If a tree is exposed to fire (such as from an uncontrolled Campfire, a Torch, or other nearby burning object) it will quickly ignite and can rapidly spread to nearby trees or other plants. It is very dangerous to be in a dense forest when trees are burning. The damage caused by fire will kill small creatures like birds and rabbits near instantly, and can also damage Wilson if he stands too close. Burning trees produce a great deal of light and heat, however they burn out quickly. Once a tree is consumed by fire it will be reduced to a burnt tree, which can be chopped down with an Axe to produce a piece of Charcoal (and occasionally a pine cone or two).

Reign of Giants
In the Reign of Giants DLC, Spiky Trees can also be found the new Desert biome.

Bugs

 * When chopping down a burning tree (not one that has already burnt) with an Axe of any kind or as a Werebeaver, the game will sometimes crash, but when it doesn't, the tree will drop as many Logs and Pine Cones as listed above using only 1% of your Axe, as if it was a burnt tree. This bug was fixed in RoG DLC.
 * When dying near a tree, items will sometimes land on top of it in an unreachable location.
 * When rapidly chopping down a tree with left click, sometimes the player's Axe will say 0% and take up one inventory space.