It is probably a red squirrel or chickaree. The chickaree or red squirrel is the smallest tree squirrel. It weighs half a pound and it is a foot long.
Red squirrels collect food in the winter.
The red squirrel will mainly eat seeds, nuts, bird eggs and mushrooms. Their enemies are raptors, foxes, martens and lynx. Grizzly bears are not their enemies. The babies are born in late April or March. They open their eyes 27-35 days after they are born.