Koford 1955 Cynomys ludovicianus March 1, 1955 Weld Co., Colo. At 11:15 I arrived at Doc. 22 colony next to OPER. I saw 17 C. l. sit in spite of 30 m.p.h. W. wind (wind raising clouds but over ploughed ground). One group of 9 in area estimated 100 x 100 yds. bordering cabined on N., 200 yds. W. of E. fence. I saw an Aquila flying ¼ mile to E. of colony + also 10± Antilocapra americana. I took 2 black & white + 2:35 mm. color photo looking N. across colony + including fence corner on E. + top of hill where eagle perch on W. Group of 3 C.l. seen to go down on burrow. Rep. of 3 seen beside another. A larger one briefly fought with smaller at edge 1 mound, smaller then going into burrow. The second con- centration animals is 2 to 5 of creels near when it crosses N. fence. Tumbleweed blows dry (10') for 3 C.l. but causes no alarm. Much Opuntia up to 4" high, fine, + Parmelia, Stielastrum & reduced to about 6" high & wide. Occasional Yucca clumps, not browsed. Dogs not overly wary. Three at mouth of burrow allowed approach to 150 yds. Wind difficult to walk against; may be 40 m.p.h. I visited vicinity burrows. Most still show no activity. Few tracks, scentings, a fresh droppings, so evidently much less activity here than in Spring Canyon Dam colony. Shreds of Parmelia in active burrows suggest that they may eat this poisonous plant. Much eating of dry Opuntia leaves near active burrows (must have eaten some before today), but no evidence of eating roots Opuntia. Some clumps had about 3% of leafs eaten. Pulled up bare Buckthorn (?) and burrow. Ground wet with water standing near foot banks melting snow. I returned to Spring Canyon Dam colony & took 9± in Trap 3, 220 in Trap 4, + 718 in Trap 12. I saw three