For keen observers, a walk to the grocery store or a hike up a mountain can inspire questions. Where do magpies nest? Why doesn’t a spider stick to its own web? How do water striders keep from sinking? Every week since 1992, Field Notes has inquired about Montana's natural history. Produced by the Montana Natural History Center, Field Notes are written by naturalists, students and listeners about the puzzle-tree bark, eagle talons, woolly aphids and giant puffballs of western, central and southwestern Montana.