This comment makes a very good point. the squirrel has a distinct facial expression, which is not so common with "candid" wildlife photos! it gives the impression of what you could call "character" or "personality! Heck, those of us who spend time with critters such as dogs or cats really thrive when those critters show some lively facial expressions (and photos that bring that out are well-loved!
And so,as you spend time around those critters, it pays to be patient and certainly watchful! Sometimes you may observe the subject being "active", and getting a set/sequence of shots can really pay off, because there is a chance you may catch one of those expressions!
Thats the truth..