The red fox is a small canine who averages 6-15 lbs (3-7 kg). They are typically red in color, though black, silver, and cross are also common fur colors. Features such as the white-tipped tail and black-tipped ears can be used to identify a red fox regardless of color.
The variety in fur color arose partially from captive breeding of foxes on fur farms. Historically, fur farmers would raise animals on islands and feed them local salmon. When fur farms were abandoned, the farmers left the animals to fend for themselves. The foxes who survived produced the variety of fur colors you see in the wild red fox population today.