It's calving season at Stavick Simmental Ranch in Veblen and this year they were surprised with an extremely rare occurrence, a quadruplet set of healthy bull calves.

Stavick Simmental in Veblen, South Dakota welcomed a once-in-a-lifetime experience of quadruplet bull calves born last week.

A ranch family in Veblen, South Dakota, had a once in a lifetime experience Tuesday night when one of their cows gave birth ...