Munchkins are, as has been previously pointed out, two inches tall. Otherwise, they look more or less like humans. It is generally assumed that they have somehow managed to come up with some kind of crude clothing, though, since they lack even the most rudimentary comprehension of manufacturing, it's something of a mystery of where this clothing comes from. Munchkins don't really have genders (though they mostly seem vaguely male), and there doesn't appear to be any way for Munchkins to reproduce. From this, it may be extrapolated that Munchkins are a dying race. Munchkins haven't really bothered to think about this, and anybody else who is aware of their existance is generally pleased with the notion of their imminent extinction.

Munchkins can and do communicate with each other, though their communication is generally pretty inane and characterized by a great deal of arguing as to the appropriate course of action and interpretations of the mandates of the Great Glowy Box. However, Munchkins are abjectly incapable of understanding any human language. Period.

Anybody with any kind of understanding of biology will tell you that 2" tall marginally intelligent social anthropomorphic bipeds are a strict impossibility, which is why you should have no trouble suspending your disbelief when the author informs you that Munchkins do not need to eat, but are fond of eating when possible. Indeed, they can eat quantities far in excess of their actual body weight in a single sitting. Munchkins are also quite fond of drinking, especially anything with alcohol. They can and do get drunk. They have no special immunities to poison or the like, which can be problematic for the universally illiterate Munchkins if a rat-poison box happens to look similar to a cereal box.

Munchkin society, such as it is, can be understood only through the understanding of the Great Glowy Box. Munchkins are quite entranced with the Great Glowy Box, and they think it self apparent that the Great Glowy Box is a manifestation of the Divine on Earth. Munchkins have also grasped that the Great Glowy Box is some means of communication, and, as such, must obviously carry the Word of God. Most Munchkin arguments stem from disagreements over what, precisely, the Great Glowy Box is telling them to do. Generally, a Munchkin who can make a convincing case for his original and interesting interpretation of the mandates from heaven is as much of a leader as these beings have.

Interpreting the Glowy Box is so important that it has an entire chapter devoted to it.

Munchkins generally have very visceral mind-sets. They understand fighting and eating and generally causing trouble, burning things, and very little else. However, being at the bottom of the food chain as they are, they generally speaking do not fight with themselves (well, more accurately, they fight frequently but usually briefly and ineffectually), and concentrate most of their efforts on their racial enemies: The Humans.

Humans are despised by the Munchkins as the great demons that keep the Glowy Box in servitude (meaning that they occaisionally turn it off) and are generally unhappy with the presence of Munchkins in their house, having a propensity to set mousetraps and the like. They also feed cats and dogs, who are usually the most immediate threat to a Munchkin's continued well-being. For this reason, Munchkin activities which do not revolve around following whatever orders they conceive the Glowy Box to have given them are usually centered around trying (generally without any great success) to drive off the Humans and their pets.