#bird definition

• Auk — A medium-sized seabird of the family Alcidae, distributed across arctic and temperate regions of the Northern Hemisphere. It features black-and-white plumage resembling that of penguins, short wings excellently utilized for swimming and deep underwater diving in search of food (small fish and crustaceans), but which also allow a rapid, though heavy-takeoff flight.
• Avis — A term borrowed directly from Latin (where it means 'bird'), used in old Romanian, archaic legal texts, or scientific ornithological works to designate a bird or a winged creature. Additionally, this etymological root forms the basis of many modern aviation and aeronautical neologisms (such as 'avion' or 'aviator'), being preserved as a reference element in classical taxonomic classifications.