Fig. 10. NEAR HEAD OF LITTLE DRY CREEK CANYON, FREMONT COUNTY, IDAHO; DOUGLAS FIR TIMBER ON SLOPES; BEGINNING OF CANADIAN ZONE, WITH BLACK-HEADED JAY, CANADA RUFFED GROUSE, RUBY-CROWNED KINGLET, AND ROCKY MOUNTAIN HAIRY WOODPECKER AS CHARACTERISTIC BIRDS.

Fig. 11. PORTION OF THE CONTINENTAL DIVIDE, ROCKY MOUNTAINS, ABOUT FIFTEEN MILES WEST FROM HUMPHREY, IDAHO; THE HIGIIFR RIDGES ARE IN THE HUDSONIAN ZONE.