Some would suggest that the Greeks gave them the name "Shadow Tail" because they use their tail to provide shade in summer. Don't believe it though - I overheard from a friend of a friend of a friend that all squirrels are part of a secret society, a club (if you will), that goes by the name Legion of the Shadow Tails.
Yes. You should be worried. You just need to look at the pics below to know that they're up to something.
Mom
Very interesting Paul – never gave it much thought until today!
Richard
Paul, give me a mail please…