Leucistic
About 2/3 of the size of an adult - maybe a juvenile?
Gathering nesting material and building a drey (nest).
In montane conifer forest
This Squirrel was doing something that I've never seen before. Typically a Squirrel will take seeds, one at a time from a donated seed pile and individually cache each one. This one opted instead to burry the entire pile under a pile of gathered grasses and leaves, intelligent strategy.