When the sky above the great, ancient forests of USA , Canada, Mexico, Honduras or Guatemala shroud in darkness, high upon the treetops you can hear the flapping sound other than a bird's wings. You can assume it's unusual lodger of those woods. We are, of course talking about a flying squirrel, Glaucomys Sciuridae, mammal, rodent from sciuridae family. His fur is gray and brown on his back, almost white and really smooth on his belly. He can glide the air between the trees thanks to membranes that stretch from his cheeks to ornate tail. Although, he is almost invisible in day light, hiding in the treetops of deciduous and mixed forests. The animal was discovered 1758. Carl von Linne was the founder of this amazing creatures.