Original sentence: A harrier is any of several species of diurnal birds of prey which fly low over meadows and marshes and hunt or harry small animals or birds (hence their common name).Harriers constitute Circinae sub-family in the Accipitridae family.Most are in the genus Circus, the  scientific name arising from the circling movements female and male make when mating.Other harriers are in the monotypic genus Geranospiza, and genus Polyboroides, generally known as Harrier-hawks.Polyboroides has two species, which are allopatric and restricted to the Afrotropic ecozone
Edited sentence: A harrier is any of the several species of diurnal hawks forming the Circinae sub-family of the Accipitridae family of birds of prey.Harriers characteristically hunt by flying low over open ground, feeding on small mammals, reptiles or birds.Most harriers are placed in the genus Circus, the scientific name arising from the circling movements female and male make when courting.The remaining single species forms the monotypic genus Geranospiza.Two other harriers are in the genus Polyboroides, the harrier-hawks, which are allopatric (geographically separated) and restricted to the Afrotropic ecozone