THE ORIGINAL BOOK-ENDS | Western small-footed myotis bats (Myotis ciliolabrum) keep track of the literature use in a cabin near Bob Marshall Wilderness in Montana, United States. Tipping the scales at a full 3 grams (after a good meal), this species is one of the smallest in North America. The hundred year-old cabin, dubbed "BatHaven", hosts an usually large breeding colony in the attic. After a night of busy hunting for mosquitoes and caddisflies, some bats, scrambling to get back into the attic at dawn, run out of time and settle for a day roost throughout the house -- in open backpacks, sleeves of hanging jackets, teapots, and on the bookshelves of the cabin's extensive collection of classy blizzard-day titles.