Fact · North Uist
Ten thousand grey seals come ashore on the Monach Isles each autumn
Every autumn around 10,000 grey seals haul out on the Monach Isles, west of North Uist, to pup and mate. It is one of the largest grey seal colonies in the world, on islands that have had no people since 1942.
The Monach Isles, or Heisgeir, lie eight miles west of North Uist. Up to 140 people lived there in 1891; the last family left in 1942. The islands are now a National Nature Reserve, and each autumn about 10,000 grey seals come ashore to give birth and mate, one of the largest such colonies anywhere in the world. The islanders' last mailboat, a 28-foot open boat built around 1932, lay unused at Lochmaddy for decades before it was rescued and restored at the Grimsay boatshed.
Sources / notes: Wikipedia: Monach Islands https://en.wikipedia.org/wiki/Monach_Islands