Since the first bird observatory was established over a century ago, hundreds have been established around the world. Classic observatories share a focus on capture and study of birds in the hand, particularly migrants. Many professionals were first inspired by working at a bird observatory, and researchers have long been using observatory data and facilities in collaborative studies. Results from observatories have made major contributions to knowledge of migration: timing, routes and destinations, body condition and local movement during stopover; as well as tracking long-term population change. Nonetheless, observatories are an underutilized resource for researchers, and this paper highlights the benefits they offer and opportunities for further cooperation.