Cynomys ludovicianus December 19, 1954 Nr. Wellington, Colorado. while out of sight in burrows. One other carried a 4" long atypical? piece of sod & [illegible] (?) to a burrow mouth who aloned. One burrow on low side of colony was surrounded by 6" high growth of dry grass (mowing?). A ridge of loose dirt about 10' high at E. edge colony showed trails + some minor diggings. Fence at S. end separates preserve from heavily grazed pasture when there are many bur- rows. If both grazing increases C. l., one would expect colony to move S. onto grazed pasture. Human tampering, offering logs & placenta, I can tractor keep the preserve from being a proper enclosure to show effects removal grazing. Shovel of one of extra mounds indicates building when soil muddy - land + smooth texture. Surprise to me, few if any more C. l. out of burrows than on previous cold overcast & windy day. 11 Moggies, 4 porcouns, + 4 bunnets came in contact with C. l. at this preserve. December 28, 1954. Nr. Nunn Weld Co. Colorado. Visited Central Plains Experimental Range with Ls. C. Klipple, Agr. Research Service, USDA, the man in charge. This area had a small C. l. colony in a shallow draw near center of section 22. Klipple said it had expanded in past season. The whole area originally possessed + reforested when government took over land about 20 yrs. ago. Perhaps other small colonies known to range riders. Eagles thought said to be commonest here in winter, K. said. I saw 4 or 5 Bato (lagopus ?) and a dead eagle.