Description: This tiny shrew is the smallest mammal in North America, and is common throughout the Rockies. It weighs less than a 10 cent piece. Despite is diminutive size, like all shrews it has a voracious appetite, spending most of its waking hours hunting small invertebrates and worms to eat. It is smaller than the other local shrews, and has a slightly shorter tail. It is gray-brown above and gray below.