This is a rare environmental process where small pieces of ice form are rolled by wind and water, and end up as giant snowballs from the size of a tennis ball to almost 1m (3ft) across in shape. Residents in the village of Nyda say they have never seen anything to compare to them. The perfectly round snowballs appeared about two weeks ago and are still intact. The site of the snowball phenomenon has become a popular spot for locals to visit and take photographs. Siberia is near record cold for this time of year, and snow cover is at around the highest level for this time of year since at least 1998. Similar snowballs were found in Lake Michigan and the Gulf of Finland in previous years.