Childs 1957 Transsects 5 & 6 2 July Patmegea River, Cape Sabine, Alaska The entire area included in these two trap lines had been worked overly caribou for about 24 hours during the last day. Although the dirt sites did not show the impact very much, there still was plenty of tracks and droppings as well as pulled up grass. They hardly moved a trap, probably curious and ignored them. In the Arctophile - Carex marshes where Microtus was found, the impact is very obvious, the grass cover broken down and pushed into the Sphagnum - muck by the broad feet. This has the effect of opening the corea and making the mice exposed to a greater extent to avian predators. The amount of caribou droppings is not great but may compare to wolves we got in 1955 for lemming. I hope to do some plots on this