They are most common in areas of savannah woodland and sclerophyll forest, and least common in heavily populated districts and arid areas with annual precipitation of less than 600 millimetres (24 in).[1][2] Emus predominately travel in pairs, and while they can form large flocks, this is an atypical social behaviour that arises from the common need to move towards a new food source.[32] Emus have been shown to travel long distances to reach abundant feeding areas. In Western Australia, emu movements follow a distinct seasonal pattern – north in summer and south in winter.