The boom grouse is a domesticated gallinaceous bird reared by farmers in northeastern Borea. Boom grouse are generally about 45 cm long and weigh about 1 kg.
Wild boom grouse are notable for their lekking behavior at "booming grounds". These booming grounds are the area in which they perform their displays in hopes of attracting females. Their displays consist of inflating air sacs located on the side of their neck and snapping their tails. These booming grounds usually have very short or no vegetation. The male boom grouse stay on this ground displaying for almost two months. During this time the males establish booming sites where they display for the females. The one or two most dominant males will do about 90% of the mating.