On the outside, the 3.5-ounce creature, called Krusatodon kirtlingtonensis, looked very similar to a modern shrew or mouse ... But analyzing these two skulls discovered on the Isle of Skye ...

Measuring only about 2- to 4-inches long, including their tail, the tiny shrews have reddish brown or grayish-brown fur, ...

This is called caravanning. A recent study at Stony Brook University found the Eurasian common shrew, which doesn't live in Montana, can shrink its brain, skull and other organs as much as 30% to ...