The animals' unusual looking drooping nose covers their mouth to stop dust entering their lungs during their long migration in the summer. And in the winter long nostrils warm cool air before it enters their lungs.
From November saigas travel up to 620 miles (1,000km) to their winter grounds in the south where they mate. More than 3,000 saiga gathered at the sanctuary as Mr Trolle captured his photographs.
Source: dailymail