Polarornis is a genus of prehistoric bird, either a possible member of the Vegaviidae or Aequornithes. It contains a single species Polarornis gregorii, known from incomplete remains of one individual found on Seymour Island, Antarctica, in rocks which are dated to the Late Cretaceous (López de Bertodano Formation, about 66 Ma).
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).