A group of squirrels is called a dray or a scurry. The dray or drey specifically refers to the nest or a nest of squirrels and is often employed to describe a mother and her young. Squirrels are relatively solitary animals (i.e. not pack animals) making scurries, somewhat, but not entirely, uncommon.
This is the first cache by FETTSquirrel and family as we settle into our new "tree" nearby.