黔(qián) 驴(lǘ) 技(jì) 穷(qióng)-- All tricks have been exhausted.

黔： Guizhou Province or black color；驴：donkey, ass；技：trick; skill；穷：end

The Donkey of Guizhou

A long time ago, when there were no donkeys in Guizhou Province, the sight of the animal caused great curiosity and excitement. One day, someone brought a donkey into the province and tied it to a tree at the foot of a mountain. A tiger saw the donkey, and thought that it was a monster. It hided behind a tree to spy on the donkey. When the donkey brayed, the tiger was frightened, thinking that the donkey was about to attack and eat it. After a while, seeing that the donkey had not moved, the tiger approached it and started teasing it. The donkey grew angry, and kicked the tiger. The tiger thought to itself: "Is that all it is capable of?" It then jumped on the donkey and ate it.