As we approached this Fox Squirrel he made a comically half-hearted attempt to conceal himself behind a branch. The squirrel quickly lost interest in hiding and soon resumed his prior business.
Wikipedia has this to say about Fox Squirrels:
Fox squirrels are strictly diurnal, non-territorial, and spend more of their time on the ground than most other tree squirrels. They are still, however, agile climbers. They construct two types of homes called “dreys”, depending on the season. Summer dreys are often little more than platforms of sticks high in the branches of trees, while winter dens are usually hollowed out of tree trunks by a succession of occupants over as many as 30 years. Cohabitation of these dens is not uncommon, particularly among breeding pairs.