Are all mice born with fur?

Yes, all mice are born with fur. Mice are mammals, and all mammals are born with a covering of hair or fur. The fur of a mouse helps to keep it warm and insulates it from the cold. It also helps to protect the mouse's skin from injury. Mouse fur can vary in color and texture, depending on the breed of mouse. Some mice have short, smooth fur, while others have long, curly fur. Some mice have white fur, while others have black, brown, or gray fur.