The term 'barn bird' can refer to three different species of birds: an OWL, a SWALLOW, and a hootowl. Owls are nocturnal birds of prey with distinctive facial features, and they are often associated with wisdom and mystery. Swallows are small, agile birds that are known for their aerial acrobatics and mud-nesting habits. Hootowls are a type of OWL that is characterized by its loud, distinctive call. All three of these birds are commonly found in barns, making them ideal candidates for the term 'barn bird'.