Grizzled gray upperparts, a blackish band on each side of the muzzle, and a black-tipped tail are some of the characters by which the gray fox differs from the red fox. Other differences include ...

White matter and gray matter are distinct types of areas of the brain. Both are essential for thinking skills, emotions, and muscle movement. You may have heard the terms “gray matter” and “white ...

The gray squirrel’s appearance differs seasonally. The yellowish brown summer coat becomes thicker and gray in winter, the pelage of some individuals strikingly silver-gray. Underparts and eye-rings ...