They are a very interesting (and tasty) animal that we practically owe the colonization of North America to.
Able to move three dimesionally with lightening speed
Omnivorous (yes, omnivorous)
Immensely strong for their size
Incredible eating if prepared correctly.
Pre-colonial North America east of the Miss river was almost entirely climax forest. Deer were actually rare there until the colonial sparked creation of farmland opened up the necessary area, and created the edge growth vital to whitetails and other forbe eating ruminants. One creature existed here in huge numbers- the tree squirrel. It fed early settlers so much and so often that it shaped the evolution of modern firearms and thus was born, "The Kentucky squirrel rifle"