I've always paid more attention than people may think. A wise man once said "Don't see, observe." That is to say, its important to not only look, but look closely.
*Gamma points to one of the squirrels, its flat against the tree's bark, making it difficult to see were it not for the bushy tail*
Its a form of camouflage. When completely still it becomes nearly invisible.
I've always had somewhat of an interest in wildlife, find them beautiful, in their own way.