Limenavis is a prehistoric bird genus from the Late Cretaceous. It lived about 70 million years ago, around the Campanian- Maastrichtian boundary. Known from several broken bones, the remains of the only known speciesLimenavis patagonica were found in rocks of the "lower member" of the Allen Formation at Salitral Moreno, 20 km south of General Roca, Río Negro ( Argentina).
Of all the prehistoric birds known to date, this species is among those closest to the common ancestor of all living birds. Its generic name pays tribute to this fact: Limenavis, meaning "bird of the threshold" or "limit-bird", is derived from Latinlimen ("threshold") + avis ("bird"). The specific namepatagonica refers to the specimen's Patagonian provenance.