Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) mother returning to her 35 day old babies in nest to nurse them, Rocky Mountains, North America

Sumio Harada / Bighorn Sheep (Ovis canadensis) males butting heads while a third looks on, Rocky Mountains, North America

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) climbing tree, Rocky Mountains, North America

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) curious 40 day old babies peer out from nest in tree trunk, Rocky Mountains, North America

Sumio Harada / American Pika (Ochotona princeps) on rock with vegetation for nest building, Grand Teton National Park, Wyoming

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) mother nursing her 19 day old babies in nest in tree trunk, Rocky Mountains, North America

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) mother nursing her 15 day old babies in nest, Rocky Mountains, North America

Sumio Harada / Old Faithful Geyser spouting, Yellowstone National Park, Wyoming

Sumio Harada / American Beaver (Castor canadensis) portrait, Rocky Mountains, North America

Sumio Harada / Mountain Goat (Oreamnos americanus) portrait, Rocky Mountains, North America

Sumio Harada / Mountain Goat (Oreamnos americanus) standing in wind, Glacier National Park, Montana

Sumio Harada / Mountain Goat (Oreamnos americanus) looking down from rocky, steep mountain slope, Rocky Mountains, North America