Near present day Chamberlain, South Dakota, Lewis has identified several trees, including a small species of oak and its acorns.
Capt. Lewis, September 16, 1804--almost every species of wild game is fond of the acorn, the Buffalow Elk, Deer, bear,
turkies ducks, pigeans and even wolves feed on them; . . . .
Clark mentions pigeons in passing while at the Great Falls portage, Montana. The following day, Lewis writes another account from above the falls.
Capt. Clark, July 12, 1805--a few wild pigions about our camp.
Capt. Lewis, July 13, 1805--I saw a mumber of turtledoves and some pigeons today. of the latter I shot one; they are the same common to the United States, or the wild pigeon as they are called.
Capt. Clark, August 26, 1805--a number of ground Lizards, Some fiew pigions.
Heading back East, and already across the Continental Divide, passenger pigeons are encountered once again.
Capt. Clark, July 21, 1806--Since I arrived at this Camp also antelops, wolves, pigions, Dovs, Hawks, ravins, crows, larks, Sparrows, Eagles & bank martins &c. &c.
Capt. Lewis, July 25, 1806--R. Fields and myself killed nine pige which lit in the trees near our camp on these we dined . . . .