seabirds, relatives of the petrels, feeding on planktonic crustaceans and small fish picked from the surface, typically while hovering. The flight is fluttering and sometimes bat-like. Until 2018, this family's species were included with the other storm-petrels in family Hydrobatidae. White-bellied storm-petrel, Fregetta grallaria Black-bellied storm-petrel, Fregetta tropica Wilson's storm-petrel, Oceanites oceanicus White-faced storm-petrel, Pelagodroma marina (V) Northern storm-petrels Order: ProcellariiformesFamily: Hydrobatidae Though the members of this family are similar in many respects to the southern storm-petrels, including their general appearance and habits, there are enough genetic differences to warrant their placement in a separate family. Band-rumped storm-petrel, Hydrobates castro (H) Leach's storm-petrel, Hydrobates leucorhoaShearwaters Order: ProcellariiformesFamily: Procellariidae The procellariids are the main group of medium-sized "true petrels", characterized by united nostrils with medium septum and a long outer functional primary. Southern giant-petrel, Macronectes giganteus Northern giant-petrel, Macronectes halli Southern fulmar, Fulmarus glacialoides Cape petrel, Daption capense Kerguelen petrel, Aphrodroma brevirostris (V) Great-winged petrel, Pterodroma macroptera (V) Soft-plumaged petrel, Pterodroma mollis Black-capped petrel, Pterodroma hasitata (H) (endangered) Atlantic petrel, Pterodroma incerta (endangered) White-headed petrel, Pterodroma lessonii (V) Trindade petrel, Pterodroma arminjoniana Fea's petrel, Pterodroma feae Blue petrel, Halobaena caerulea Broad-billed prion, Pachyptila vittata (V) Antarctic prion, Pachyptila desolata Slender-billed prion, Pachyptila belcheri Bulwer's petrel, Bulweria bulwerii Gray petrel, Procellaria cinerea (V) (near-threatened) White-chinned petrel, Procellaria aequinoctialis Spectacled petrel, Procellaria conspicillata Cory's shearwater, Calonectris diomedea Cape Verde shearwater, Calonectris edwardsii Short-tailed shearwater, Ardenna tenuirostris (V) Sooty shearwater, Ardenna grisea Great shearwater, Ardenna gravis Manx shearwater, Puffinus puffinus Little shearwater, Puffinus assimilis (H) Audubon's shearwater, Puffinus lherminieri Magellanic diving-petrel, Pelecanoides magellani (V) Storks Order: CiconiiformesFamily: Ciconiidae Storks are large, long-legged, long-necked wading birds with long, stout bills. Storks are mute, but bill-clattering is an important mode of communication at the nest. Their nests can be large and may be reused for many years. Many species are migratory. Maguari stork, Ciconia maguari Jabiru, Jabiru mycteria Wood stork, Mycteria americanaFrigatebirds Order: SuliformesFamily: Fregatidae Frigatebirds are large seabirds usually found over tropical oceans. They are large, black-and-white or completely black, with long wings and deeply forked tails. The males have colored inflatable throat pouches. They do not swim or walk and cannot take off from a flat surface. Having the largest wingspan-to-body-weight ratio of any bird, they are essentially aerial, able to stay aloft for more than a week. Lesser frigatebird, Fregata ariel Ascension frigatebird, Fregata aquila (V) Magnificent frigatebird, Fregata magnificens Great frigatebird, Fregata