Procelsterna

 Procelsterna  is a genus of birds in the tern family. It consists of two species, which are sometimes considered to be conspecific. Lesser Noddy is sometimes consider to be a subspecies of Black Noddy
 * Blue Noddy, Procelsterna cerulea
 * Grey Noddy, Procelsterna albivitta

These are grey-plumaged terns of tropical oceans, which nest colonially. They feed on small fish picked from the surface.