Koford 1455 Cynomys ludovicianus February 22, 1955 Nr. Ft. Collins, Colo. mid it (0711). Set 4 new steel traps & reset some of other 10 (1 spring), Notes when 2 traps set showed no activity (first traps set here) snow storm. Another pair burrows that were plugged with snow yesterday were open today. Two plugged with snow had digging about 3" deep in outside plug, but not through plug. Dog tracks near some burrows & dog defeated in one. February 23, 1955. About 2" snow fell, starting last night, but a little sunshine this morning and temp'd to 30°F. I visited Spring Dam colony at 1:30 p.m. & found by tracks that only one had been active. It had walked to several objects that protruded thru snow (cows dung, rocks, Salsola) & had scattered particles of Salsola & exposed more (also Xanthium) beneath. Had gone up to 11 yds. air line from burrow & had made about 4 trips out & back. Since previous storm this same burrow active & also no connecting tracks with others. Present construction profile looks much greater N. of fence line (near in parts but perhaps better grazing) than S. Population estimate 15 N. of fence within 100 yds. distance & 75. of fence within 200 yds. Apparently dead part of colony extends on to S. 1/4 mile. February 24, 1955. Clear, calm, 6°F. at 8 a.m. Visited Spring Dam Colony. About 2" dry snow on ground. At 8:45 a.m. more yet out the same bright & no wind. 9:07, first seen out. Setting by burrow. Same as where only tracker yesterday. 9:10, walker, tail up & vibrating at singular intervals. It puts more its snow here & there. Looks up often as if for danger. [illegible]