Query: Harriers (birds)
Relevant documents:
Harrier (bird)
Hen harrier
Montagu's harrier
Pallid harrier
Northern harrier
Western marsh harrier
Eastern marsh harrier
Swamp harrier
Pied harrier
Black harrier
Cinereous harrier
Spotted harrier
Papuan harrier
Malagasy harrier
Réunion harrier
African marsh harrier
Long-winged harrier