c1902  (1912)  The moose herds are yarding up in some sheltered feeding-ground.
1958  In winter, especially during periods of deep snows, the deer "yard up."
1964  Ezra Ames . . . said the moose had started to "yard up," which they do at this time of year, travelling [in] herds of up to 20 bulls, cows, calves and yearlings.