Scientists have documented an unusual mass death of walruses at a Chukotka rookery, with over 100 carcasses. In October, the rookery on Cape Serdtse-Kamen was occupied by walruses of the American group from Cape Point Lay, but their fatigue after a long passage through open water is thought to have caused the high mortality. This year, the number of walruses at the rookery was slightly more than 10 thousand individuals. In other years, scientists counted up to 100 thousand animals.