 The beak was shorter than that of modern frigatebirds, and lacked the typical hook at the end, resembling a strong booby beak more than that of today's frigatebirds.The species differ conspicuously in size, with "L. hasegawai" being as much larger when compared to "L. azygosternon" as today's largest species of frigatebird ("Fregata minor") is compared to the smallest extant one ("Fregata ariel").The bill of "L. hasegawai" was notably larger still than that of its congener, whereas its feet were smaller, echoing a pattern found in the extant "Fregata" species.