Treeguard

Treeguards are monsters from Klei Entertainment's Don't Starve game and its expansions.

Description
These entities come in three unique varieties: Regular, Lumpy or Palm. These beings were either transformed through magical energies, or evolved naturally as a method of camouflage. As previously mentioned, they are of an arboreal appearance. They will wait for a player to hit one whilst clearing forest, mistaking it for a tree, whereupon it will attack with the intent of killing the player, although they will also engage any nearby hostile creatures. They have the same growth rates as normal trees; however, they will gain greater strength and durability as they mature. It should be noted that Treeguard are particularly susceptible to fire damage.

Trivia

 * Treeguard in the game are actually listed under the term " Leif ", which is in fact a forest spirit from Nordic mythology.
 * Fully-grown Treeguard have the most health and damage of all opponents in their world.
 * In the Don't Starve: Shipwrecked DLC, the Palm Treeguard was added to the games, creating yet another unseen enemy.
 * in Don't Starve Together, there is a similar enemy known as a poison birchnut tree, which may be an evolutionary relative