 However, this source of food can be unpredictable, as the "Eciton burchellii" colonies' raiding zones are always shifting.It has been shown that the obligate army ant-following antbird "Phaenostictus mcleannani" uses a network of individuals to locate swarms.Each mated pair of birds holds a single dominance zone that they control, which is part of a larger non-exclusive feeding zone occupied by other mated pairs.