Thundercloud only had 3 mares and 1 yearling in the spring of 2014. However, when the stallion, Copper, was badly injured, Thunder took all of his band but River, increasing his band from 6 to 13. Little Kat was the last to join the band in mid-August 2014. Thunder and his band stay to the east either on the east rim or just below it from late fall to late spring, but in summer they join the other bands in the area of Talkington Trail, Boicourt, and Lindbo Flats. Thundercloud is a full brother to the late High Star. He seems to have developed a cooperative agreement with Sidekick since they are often found together.