The U.K. is home to two species of seal, the gray seal and the smaller harbor seal. In some areas of Scotland, harbor seal numbers are in decline or are at drastically depleted levels compared to 20 years ago. The U.K. is home to two species of seal, the gray seal and the smaller harbor seal. In some areas of Scotland, harbor seal numbers are in decline or are at drastically depleted levels compared to 20 years ago. Ecology Phys.org – latest science and technology news stories