* Black: Some rats are entirely black, especially in certain breeds.
* Brown: Many rats are brown, with varying shades from light brown to dark brown.
* White: Albino rats are completely white with pink eyes.
* Other colors: Rats can also be spotted, piebald (black and white patches), or have other color variations.
So, why is the common house rat often gray?
* Camouflage: Gray fur blends in well with the environments they often live in, like urban areas with concrete and brick. This helps them avoid predators.
* Genetics: The specific genes that determine coat color in rats can produce a range of shades, including gray.
* Selection: Over time, gray rats may have been more successful at surviving and reproducing in certain environments, leading to a greater prevalence of gray coloration.
It's important to remember that not all rats are gray! Just like humans, rats come in a variety of colors and appearances.