Birdlife refers to the collection of birds in a particular area or ecosystem. There are several synonyms for birdlife, including avifauna, bird population, ornithofauna, ornithological community, and avian fauna. These terms are commonly used in ecology and bird-watching circles to refer to the various species of birds in a certain geographic region. Avifauna is specifically used to describe the collective bird species that inhabit a certain area. Ornithofauna is similar in meaning but refers to the bird species present in a particular time and place. Ornithological community refers to the scientific study of birds, while avian fauna is a more general term for bird species in a certain region.