Shrews are not really active in winter in cold climate since they will not survive (just ain't much food around for them).Shrews look like "mice" (small brown furry creatures) but they are blessed (or cursed) with a metabolism that makes them need food almost constantly 24/7. They're like food junkies in that they will keep pushing and pushing to get in. And they want to eat protein, too, not just honey. Shrews are after brood. Luckily for some beekeepers, shrews are not as evenly distributed in North America, nor are they as common.