sentences:  Black harriers show some degree of offidelity to breeding areas (they return to breeding areas they have used previously) as well as natal philopatry (they return to their birthplace to breed) however, large breeding dispersal may also occur.The black harrier is a small mammal specialist which feed mostly on small rodents and birds and will occasionally take reptiles, catching them while flying low over its hunting grounds.The Four- striped Mouse, Rhabdomys pumilio, is the main prey.