Avifauna is a term used to describe the BIRD species of a particular region or habitat. It is derived from the Latin words avis, meaning 'BIRD, ' and fauna, meaning 'animal life.' Ornithology, the scientific study of birds, is also known as ornis. Avifauna includes all species of birds, from the smallest hummingbirds to the largest eagles. Avifauna can be studied in terms of their behavior, ecology, physiology, and evolution. Avifauna can also be studied in terms of their impact on the environment, such as their role in pollination and seed dispersal.