From publisher blurb:
Pound for pound, muscle for muscle, bugbears are stronger, sneakier and far more unpredictable than their other goblinoid cousins. They are brutal guerrillas who strike fast and fade away, bursting onto the scene to wreak terrible havoc before vanishing. If they could ever unite under a single banner, or maintain the military discipline of the hobgoblins, they would shake the heavens with their rage. Fortunately for the rest of the world, bugbears are as fractious as they are violent, driven by chaotic urges and consuming greed that prevent them from developing the social structure of more advanced races.