It's a place which conducts long-term monitoring of bird populations and migration.
Individual observatories are located at prime migration points where a daily census is taken in a defined recording area.
An integral part of observatory work is bird ringing, undertaken within the national British scheme which is coordinated by the British Trust for Ornithology. This provides data for guiding conservation policies of such bodies as Natural England, Natural Resources Wales, Scottish Natural Heritage and their counterparts in Ireland.
The Observatories encourage volunteers to participate in scientific studies of birds and the environment. The results of these studies and more general information are made freely available to researchers and to the public who are welcome to visit observatories.