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Northern Harrier Circus cyaneus (or Hudsonius)
The AOU still consider the North American form to be conspecific with the Hen Harrier of the Old World, though many authors consider them separate species. If the North American form is a distinct species, its scientific name is Circus hudsonius. Some authors also consider the South American Cinereous Harrier Circus cinereus to be conspecific. I have only ever seen this species on two occasions in northern Central America and both times it was in El Salvador. The first one was at the small reed-fringed lagoon at Colima. My other sighting was at the Rio Jiboa. Howell and Webb call this an uncommon to fairly common winter visitor and transient to the region.