 These northern peoples, whose descendants founded the kingdoms of Bunyoro-Kitara and Buganda, are said to have brought with them new breeds of cattle as well as varieties of banana.It remains unclear as to why these peoples moved into the region but evidence indicates severe ecological change that facilitated the movement of people with specialized cattle herding practices for adapting to environmental stress.One of the main strategies for adapting to environmental stress included using cattle manure to maintain soil fertility for banana groves, a practice the Haya continue to this day but at a reduced level due to a decline in cattle holding that began after the 1890s rinderpest epizootic.