number so they don't overgraze r:e land. >> ready? >> reporter: after the round-up, they're vaccinated, calves are branded, and some cows are sold. for lantis, it never gets old. >> when you quit doing the thing you like to do, you're going to die. ngam, spread out across here. >> reporter: for this cowboy, living a good, long life means making your home where the buffalo roam. chip reid, cbs news in the black iclls of south dakota. >> dickerson: that's the "cbs evening news" for tonight. for scott pelley and all of us at cbs, i'm john dickerson. i'll see you back here tomorrow night and sunday on "face the nation." thanks for watching. good night. capttioning sponsored by cbs captioned by media access group at wgbh access.wgbh.org