It is not uncommon for zuds to kill over 1 million head of livestock in a given winter. The 1944 record of almost 7 million head of livestock lost was shattered in the 21st century. Of note, the arctic oscillation in both 1944–45 and in 2010 was pushed much deeper into Central Asia bringing prolonged extreme cold weather. In 1999–2000, 2000–2001, and 2001–2002, Mongolia was hit by three "zuds" in a row, in which a combined number of 11 million animals were lost.