The Oskolki Islands
The Oskolki Islands is a small group of rocky islands of the Lesser Kuril Ridge south-west to Polonskogo Island. The Oskolki Islands include the Lisyi Islands, the Shishki Islands and the Peschernaya Rock. These Islands are unique because of their seabird colonies: spectacled guillemot (Cepphus carbo), tufted puffin (Fratercula cirrhata), rhinoceros auklet (Cerorhinca monocerata), thick-billed murre (Uria lomvia), common murre (Uria aalge), red-faced cormorant (Phalacrocorax urile) and seagulls.
The southernmost breeding herd of steller sea lion (Eumetopias jubatus) is also located there. Steller sea lion is a rare species from the Otariidae (eared seal) family. It is included to the Red Data Book of Russia. The largest herds of eared seals (Phoca vitulina stejnegeri, Phoca largha) are located on the Demina Islands (the Lesser Kuril Ridge). It is the main habitat of the southernmost sea otter (Enhydra lutris) population on the Kurils. Its population has risen to 100 individuals in recent years.