Harriers are birds of prey often associated with the world's wetlands: marshes, swamps and bogs. Most birds patrol low over this open ground hunting small mammals, reptiles and birds. Nests are made in the dense vegetation on the ground. Many of the 14 species in this group, such as the pallid harrier and Montagu's harrier, are migratory and move to warmer climates for the winter. Some species, such as the African marsh harrier, remain in their breeding territories all year.