What animal is a little bigger than mouse dark brownfurry and seemed to crawl lower the ground mouse?

Based on your description, the animal you're thinking of could be a vole.

Here's why:

* Size: Voles are slightly larger than mice, typically 3-6 inches long.

* Color: They are typically dark brown or grayish brown.

* Fur: They have dense, soft fur.

* Movement: Voles are often seen crawling lower to the ground than mice, as they are more terrestrial and less adept at climbing.

However, without more details like the animal's tail length, ears, and habitat, it's impossible to be certain.

To get a more precise identification, consider these additional factors:

* Location: Where did you see the animal?

* Tail: Was the tail short and stubby, or long and thin?

* Ears: Were the ears small and rounded, or large and pointed?

* Behavior: Did the animal have a distinctive gait or way of moving?

If you can provide more information, I can help you narrow down the possibilities.