Last fall, our tracking club decided to study the shorelines of Nicasio Reservoir, with its extensive drought-exposed lakebeds and amazing amount of bird and mammal activity near the water and up in the brushy banks. Tracks stretch in a progression from high-water shorelines to dry-season, low-water edges. As the water level drops and the lakebed dries, the tracks are preserved as a calendar, revealing which animals were prevalent as the seasons moved from spring through…