What is the meaning of the phrase 'тарбаганнар кыра шаап алыр дээш, борбак даштарга боттарывыс кыра шаптырып алыр часкан бис.'?

This phrase translates to: 'Because the marmots were digging into the snow, we had to manually cover ourselves with pebbles on the round stones.' It describes a specific action taken during the hunt, implying a method to protect themselves or their provisions from the marmots by using stones as a barrier.