>> dickerson: our final stop tonight is home on the range, tonight is home on the range, where hundreds of the nation's most treasured animals will be auctioned off over the weekend. of course, you can't sell them until you round them up, and chip reid got to ride with the trail boss. >> reporter: the earth rumbles as 1,100 buffalo stampede across the south dakota prairie, while about 60 volunteer cowboys and cowgirls ride herd, including-- >> okay, i want somebody to sit right here. >> reporter: --81-year-old bob lantis. >> i don't care who, two people. if you about it in there and charging, you about it right. o reporter: this spur-jingling, heaps-wearing buckaroo has participated in the nation's