The Calf of Man is a small island in the Irish Sea, which sits approximately 1/3 mile from the larger Isle of Man to its northeast. For many years, the island was under private ownership, but it was donated to the National Trust due to its importance as a refuge for nesting sea birds. There are presently 33 species of seabirds who visit the island during the breeding season, but it is perhaps best known for its population of Manx Shearwater, which come to land each night and return to their burrows. The island currently has no permanent human population but visiting researchers and ornithologists may stay for short periods of time.