The British Ornithologists' Union (BOU) is a professional organization dedicated to the study and conservation of birds in the United Kingdom and beyond. Founded in 1858, it promotes ornithological research and provides a platform for sharing knowledge among bird enthusiasts, researchers, and conservationists. The BOU publishes the journal *Ibis*, which features scientific articles on various aspects of ornithology. The BOU also organizes conferences, workshops, and field trips to engage members and the public in birdwatching and research activities. It collaborates with other organizations and supports initiatives aimed at protecting bird species and their habitats, contributing to the broader field of conservation biology.